Date   

Re: HK Citation 18

thetraingallery@...
 


Thanks Eli,

Barry


Re: Amazing new cable

bnqr <banquer@...>
 

--- In FMtuners@yahoogroups.com, Goran Finnberg <mastering@t...>
wrote:
A word first:

http://www.bstock.com/Lirpa1.htm


--
Best,

Goran Finnberg
The Mastering Room AB
Goteborg
Sweden

E-mail: mastering@t...

Learn from the mistakes of others, you can never live long enough to
make them all yourself. - John Luther
Thank you Goran. I have posted that on a few other consumer audio
forums and believe it or not at least one person has taken it
seriously. In any case I never new what Dr. Lirpa's first name was
until I read this link.
Thanks for the laughs;
d.b.


Re: tandberg-tuner 3001 vs. 3001a

alal200200 <alal@...>
 

When Tandberg had an office in NY I contacted the techs about the
differences between the 3001 & 3001A. According to them it only had to
do with the appearance - black vs. silver case.

Tandberg also claimed that "improved" and better sounding caps were
used, but I never bothered to verify this as my silver 3001 and black
3001A sounded no different from each other.

The service manual is the same for both and lists the production
changes from early to late units.

The last serial number I know are in the 3000 + range. This was a
tuner bought by a friend when Ortofon USA were clearing out Tandberg's
remaining inventory. Anyone have a later SN?


--- In FMtuners@yahoogroups.com, "michael" <tonihormoni@y...> wrote:
here in the forum are a handful owners of the Tandberg tuner 3001,
as
I suspect.

some informations about it:

originally the device had the name (TPT) "3001", above the serial
No.
700 the name did change to "3001A". the 3001 had a silver case, the
3001A came into a black case. a "cross-over"-design like the
3001/3001A-tuner, seen this week in ebay (black front-plate, rest of
the case silver), I did never see before.

the Tandberg gets rather warm at the power supply. therefore by all
appearance Tandberg experimented with the design for the ventilation
("chimney-effect"), so that there were two variants of the the upper
lid of the (3001A) case (see also: http://www.nrhf.no/nrhf-TR.html
).

in the course of the production series altogether 7 modification
steps
appeared at the tuner, and not two, how the switch of the items name
from "3001" to "3001A" suggest. nevertheless the change of the
name
is justified, because above serial No. 700 new boards were used for
decoder and limiter (the decoder-design: easily modified; the
limiter-design: strongly modified, in particular what concerns the
transistor-design).


the modifications in detail*:

(A) circuit: tuning system 1

above SN 400:
- R946 changed from 12k to 4k7
- R948 and R951 changed from 220 Ohms to 1k8
- R931 disconnected from P1001, pin 3, and connected to U906, pin 6

above SN 600:
- R940 changed from 10k to 18k
- R936 changed from 2k7 to 5k6
- CR911 replaced by a strap
- R938 changed from 60 Ohms to potm. 2k5

(B) circuit: tuning system 2

above SN 400:
- Pin11 at U1003 disconnected from R1017 and U1004, pin11, and
connected to ground

above SN 550:
- R1007 changed from 820k to 220k


( C) circuit: main board

above SN 500:
- Potm. 752 changed from 1M to 6M8
- R401 changed from 10k to 33k
- R405 changed from 47k to 100k
- R406 changed from 47k to 33k
- R408 changed from 3k3 to 2k7
- R426 changed from 1k5 to 1k
- R427 changed from 15k to 33k
- R739 changed from 2k7 to 3k9
- R732 changed from 33k to 27k

above SN 850:
- Q401/402/403/404 changed from Siemens to Motorola


( D) decoder:

above SN 400:
- Q504 changed from BC559B to BC490B


above SN 900:
- Q605/606 changed from Siemems to Motorola
- check that C530 is 68pF with U504 from Motorola, and 82pF when
using
U504 from SGS

( E) limiter: modified circuit board, above SN 700

( F) selectivity: modified circuit board, above SN 700

( G) power:

CR808 and CR812, 6.8V, changed from Siemens type to Motorola (cause:
inaccurate zener voltage)

(* see also: tandberg-service manual, p. 35)

---


for DIYers

who would like to restore himself should take hold into the eyes an
exchange of the caps C627 and C628 (only drop of bitterness: the
available height amounts about 21 mm merely. therefore you can use
only standard caps - i.e. from black gate - but not the higher grade
types from the same manufacturer).
you also could replace the 5 cement-resitors in the power supply
against MOX types.

On my tuner I have found only one deviation from the
schematics-diagram:
C501 should be - according to the diagram - a 22uF/35V Elna-type; on
my item it's a 47uF/35V Elna-Cap.


for a good 3001-item there are – on the long run - known only
three
problems:
- the heat (he always must stand "free")
- the contacts from the bridge between decoder and output; you must
clean and de-oxidize them in an interval from 4 or 5 years
- and finally the presets: these must be replaced approximately
every
10 years as it is known

by the way I don't know how many Tandbergs were build.
It would interest me therefore whether one owner in this forum has a
model with a SN above 1000? My own tandberg 3001 is a very early
item
and has the SN "00042".

best regards - mikel


Re: Pioneer F-26 What is it worth?

John Biava
 

I have never had any experience with them.  They are not in the Yellow pages.  They may no longer be in business.   We no longer have a single audio store in Rockford.  Only big box and one very small home theatre store.  And this in a city of 175,000 or so with another 60,000 surrounding it !

Hank Arnold wrote:
John,
 
Have you had an occasion to use Classic Audio in Rockford for any repairs?
 
Thanks,
 
Hank

John wrote:
    But what about the deleterious effects of over-compression, audio bandwidth limiting, excessive bass boost and the other "equalization" done to tailor the sound for the automobile listeners ?
 
    There is almost no empty bandwidth in northern Illinois.  We get noise overun from Chicago, Milwaukee, Madison and the proliferation of small town stations broadcasting everything from the farm market reports, high school sports, and hours of info-mercials.  Rockford just added another religious station so now we have four.  But we don't have a single good jazz venue.
 
    Adjacent channel noise is bad enough, and can be countered to some extent by narrowing the IF filters.  But paying a shop to do it will cost almost as much as the original price of the tuner.  And narrow IF reduces the capture ratio, so I would get more interference from the small town stations on the same frequencies.
 
    Can you imagine what it is like to be in central Illinois and be limited to the small town stations ?  Hope you like C&W and "Christian" broadcasting.....or the crap aimed at teenagers by Clear Channel !
 
    I am thankful I am not limited to radio when travelling.
 

newaag wrote:
--- In FMtuners@..., John wrote:
> With the changes coming now or soon to local programing, and the
>prospect of having to buy a digital tuner or receiver soon, what does
>"common sense" tell you ?

I don't think anyone will ever "have to buy" a digital tuner. There is
quite a bit of room in the existing IBOC spec that would allow
multiple  digital music programs, talk services, etc. AND still
classic analog transmission that our FM tuners play.
-bob



I have components to listen to music, not music to listen to components.


Discover Yahoo!
Have fun online with music videos, cool games, IM & more. Check it out!


Hank Arnold
AmNet Mortgage
Suite 300
377 East Butterfield Rd.
Lombard, IL 60148
DIRECT - 708.212.3700
FAX - 630.241.1723
 


I have components to listen to music, not music to listen to components.

__________________________________________________
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Pioneer F-101T

Mark Caracciolo <fmmods@...>
 

Anybody have the spec's or know anything about the Pioneer F-101T digital tuner? I picked it up out of my Dad's stuff; don't know anything about this particular piece. I watch E-Bay quite a bit and haven't seen one turn up. It looks to be a fairly early digital tuner with a digital timer built in. The basic spec's would be a great help in themselves. Pioneer doesn't seem to know anthing about this unit when calling on the telephone. Anyone out there have one of these or used one in the past?
Thanks for any help you can provide!
 
Mark C.

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Re: I'm searching for Audiolab 8000t manual

m_agrimi
 

Mario, are you looking for the owners manual, or a service manual?
I
have the owners manual somewhere around here. I would like to find
a
copy of the service manual, or even a schematic.

I'm looking for the owners manual. Can you post a copy of your in
file
section please

Regards
Mario


Re: What is a "romantic tuner" ?

sedond
 

well, i am not so sure "romantic" is the best term. what i am
describing is best characterized as a smooth sound, perhaps at the
expense of a small bit of detail. also, i forgot to add the sansui
tu-719 to this list, & the hitachi ht-8000 to the smooth *and*
detailed list...

the tandberg *is* nice, but i am not certain it's worth what people
usually pay for them..

regards,

doug s.

--- In FMtuners@yahoogroups.com, "Joe Kohanski" <cherrykohanski@e...>
wrote:
Interesting - I wouldn't have classed the T-12 nor TU-9900 as
romrantics!

I'd agree that the Tandberg 3001A occupies a more neutral space.
Based on my experience, that is one heck of a tuner.


HK Citation 18

brrywill <thetraingallery@...>
 

Hi,

I was lucky at a yard sale over the weekend and picked up
a nice Citation 18, as well as the 17 preamp, and the 19
amplifier. I was wondering if anyone might have a schematic
for the 18 tuner? My repair tech said there is a bad output
FET somewhere in the muting circuit (Q2), but he can't
read the numbers. He said it doesn't seem to affect the
sound and wondered if we can leave it out? If anyone has
any thoughts on that i would appreciate it. I am not a
tech, but can relay the info.

Best,
Barry


Re: Pioneer F-26 What is it worth?

slowjazz <slow_jazz@...>
 

A lot of the radio stations I listen to now play live
over the internet using Microsoft Media Player. All
you need is an internet connection.

This may be where the future is.



--- Hank Arnold <hankarnold@pobox.com> wrote:

At this point that is not the intent; nor do I
believe they will have the capability to make them a
'pay' or subscription channel.

Ownership of all stations would have to agree on
technology and then they would have to have a
manufacturer(s) deliver. Not to say it won't or
can't be done, but that's not in the cards right
now.

The idea with the side channels is to have another
revenue stream eventually; nobody knows when or how.

bta_50g <jbyrns@rcn.com> wrote:
--- In FMtuners@yahoogroups.com, Hank Arnold
<hankarnold@p...> wrote:
Yes, one will have to buy such things to received
them, i.e., the HD
signal will be free unlike XM and Sirius, but you
will have to buy
the hardware or tuner.
How do you know HD radio will be free? It was my
understanding that
the system includes the capability to offer
subscription services just
like XM and Sirius. I assume the main channel will
remain free, but
there are several additional digital channels
available, and these
could easily be used for a subscription service like
is currently
being done on some digital Television stations.

John





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Re: Pioneer F-26 What is it worth?

newaag
 

--- In FMtuners@yahoogroups.com, John <hififofum1@y...> wrote:
But what about the deleterious effects of over-compression,
audio bandwidth limiting, excessive bass boost and the other
"equalization" done to tailor the sound for the automobile listeners ?

What about it? Do you really listen to stations that do that today? If
not, who cares. I don't think going "digital" will change a thing for
those stations, either.


There is almost no empty bandwidth in northern Illinois. We get
noise overun from Chicago, Milwaukee, Madison and the proliferation of
small town stations broadcasting everything from the farm market
reports, high school sports, and hours of info-mercials. Rockford
just added another religious station so now we have four. But we
don't have a single good jazz venue.

Adjacent channel noise is bad enough, and can be countered to
some extent by narrowing the IF filters. But paying a shop to do it
will cost almost as much as the original price of the tuner. And
narrow IF reduces the capture ratio, so I would get more interference
from the small town stations on the same frequencies.

There are lots of options for people that want digital radio streams
today - internet, satellite, etc. Just use one of those and be happy
:-) We already know how bad basement dipole FM reception is in *your*
location.

Can you imagine what it is like to be in central Illinois and be
limited to the small town stations ? Hope you like C&W and
"Christian" broadcasting.....or the crap aimed at teenagers by Clear
Channel !

I am thankful I am not limited to radio when travelling.

newaag <bob@f...> wrote:
--- In FMtuners@yahoogroups.com, John <hififofum1@y...> wrote:
With the changes coming now or soon to local programing, and the
prospect of having to buy a digital tuner or receiver soon, what does
"common sense" tell you ?
I don't think anyone will ever "have to buy" a digital tuner. There is
quite a bit of room in the existing IBOC spec that would allow
multiple digital music programs, talk services, etc. AND still
classic analog transmission that our FM tuners play.
-bob



I have components to listen to music, not music to listen to components.

---------------------------------
Discover Yahoo!
Have fun online with music videos, cool games, IM & more. Check it out!


Re: Pioneer F-26 What is it worth?

newaag
 

Well, What about SCA programming today? aren't those "paid" services?
I assume the SCA type services going to digital is the extent of what
the paid services intention is.

-bob

--- In FMtuners@yahoogroups.com, Hank Arnold <hankarnold@p...> wrote:
At this point that is not the intent; nor do I believe they will
have the capability to make them a 'pay' or subscription channel.

Ownership of all stations would have to agree on technology and then
they would have to have a manufacturer(s) deliver. Not to say it
won't or can't be done, but that's not in the cards right now.

The idea with the side channels is to have another revenue stream
eventually; nobody knows when or how.

bta_50g <jbyrns@r...> wrote:
--- In FMtuners@yahoogroups.com, Hank Arnold <hankarnold@p...> wrote:
Yes, one will have to buy such things to received them, i.e., the HD
signal will be free unlike XM and Sirius, but you will have to buy
the hardware or tuner.
How do you know HD radio will be free? It was my understanding that
the system includes the capability to offer subscription services just
like XM and Sirius. I assume the main channel will remain free, but
there are several additional digital channels available, and these
could easily be used for a subscription service like is currently
being done on some digital Television stations.

John





---------------------------------
Yahoo! Groups Links

To visit your group on the web, go to:
http://groups.yahoo.com/group/FMtuners/

To unsubscribe from this group, send an email to:
FMtuners-unsubscribe@yahoogroups.com

Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.


Re: Pioneer F-26 What is it worth?

Hank Arnold <hankarnold@...>
 

At this point that is not the intent; nor do I believe they will have the capability to make them a 'pay' or subscription channel.
 
Ownership of all stations would have to agree on technology and then they would have to have a manufacturer(s) deliver.  Not to say it won't or can't be done, but that's not in the cards right now.
 
The idea with the side channels is to have another revenue stream eventually; nobody knows when or how.

bta_50g wrote:

--- In FMtuners@..., Hank Arnold wrote:
> Yes, one will have to buy such things to received them, i.e., the HD
> signal will be free unlike XM and Sirius, but you will have to buy
> the hardware or tuner.

How do you know HD radio will be free?  It was my understanding that
the system includes the capability to offer subscription services just
like XM and Sirius.  I assume the main channel will remain free, but
there are several additional digital channels available, and these
could easily be used for a subscription service like is currently
being done on some digital Television stations.

John




Re: Pioneer F-26 What is it worth?

Hank Arnold <hankarnold@...>
 

John,
 
Have you had an occasion to use Classic Audio in Rockford for any repairs?
 
Thanks,
 
Hank

John wrote:
    But what about the deleterious effects of over-compression, audio bandwidth limiting, excessive bass boost and the other "equalization" done to tailor the sound for the automobile listeners ?
 
    There is almost no empty bandwidth in northern Illinois.  We get noise overun from Chicago, Milwaukee, Madison and the proliferation of small town stations broadcasting everything from the farm market reports, high school sports, and hours of info-mercials.  Rockford just added another religious station so now we have four.  But we don't have a single good jazz venue.
 
    Adjacent channel noise is bad enough, and can be countered to some extent by narrowing the IF filters.  But paying a shop to do it will cost almost as much as the original price of the tuner.  And narrow IF reduces the capture ratio, so I would get more interference from the small town stations on the same frequencies.
 
    Can you imagine what it is like to be in central Illinois and be limited to the small town stations ?  Hope you like C&W and "Christian" broadcasting.....or the crap aimed at teenagers by Clear Channel !
 
    I am thankful I am not limited to radio when travelling.
 

newaag wrote:
--- In FMtuners@..., John wrote:
> With the changes coming now or soon to local programing, and the
>prospect of having to buy a digital tuner or receiver soon, what does
>"common sense" tell you ?

I don't think anyone will ever "have to buy" a digital tuner. There is
quite a bit of room in the existing IBOC spec that would allow
multiple  digital music programs, talk services, etc. AND still
classic analog transmission that our FM tuners play.
-bob



I have components to listen to music, not music to listen to components.


Discover Yahoo!
Have fun online with music videos, cool games, IM & more. Check it out!


Hank Arnold
AmNet Mortgage
Suite 300
377 East Butterfield Rd.
Lombard, IL 60148
DIRECT - 708.212.3700
FAX - 630.241.1723
 


Re: Sony ST-S730ES

newaag
 

I think most will only see it with instruments, i.e. in a practical
sense it does not seem to be a big problem with well aligned units.

But then again, there may have been production changes I'm unaware of.
Many of us have noted the SST circuit alignmet as dwtailed in the
service manual does not work or do anything - perhaps this was a change?
It appears to be related to the SST circuit, but I nver got around to
documenting it. It is now clear that it's very different from the
Yamaha CSL circuit.
Bob
--- In FMtuners@yahoogroups.com, "John Robinson"
<johnrobinson101@a...> wrote:
How bad is the frequency drift in this model? Does anyone know how it
can be fixed.


Re: Sansui TU-217 Stereo Problems - Need Help!

mjconn42
 

Ken,

Thanks for your response and suggestions. Input voltage on pin 1 is
11.5 volts, so it is a little low. I tuned to a strong station and
then adjusted VR03. There was no effect. Signal strength meter
stayed up in the 4 of 5 range, but the sound and stereo LED still
cut out. I'll try to find a tech in this area. I'm in Spartanburg,
SC near Charlotte, NC. Anyone know of a good technician in the area?

Marc

--- In FMtuners@yahoogroups.com, "kbernacky" <kbernacky@y...> wrote:
--- In FMtuners@yahoogroups.com, "mjconn42" <mjconn42@y...> wrote:
I am new to this group and need help with a recently purchased
TU-
217.

The unit powers up and works fine for 10-20 seconds in "FM
Auto/muting on" mode. Then the stereo LED and all sound begins
to
cut
out, then on for a few minutes. Finally I can get no sound or
stereo
LED after the unit warms up.
snip

Mjconn42:

If the HA1196 is getting the correct supply voltage, pin 1 has
approx. 12 volts, and your item is reasonably close to being
aligned
then my money is on the Vco free run frequency being just on the
edge
of proper adjustment. This adjustment is connected to pin 16 of
the
HA1196 and is likely labeled VR03, VCO, your schematic calls it
vco
free run frequency adjust. Assuming you don't have a frequency
counter you can use a strong station known to be broadcasting in
stereo to adjust this. Properly tune in this strong station and
while watching the stereo led and using a non metallic tool SLOWLY
adjust VR03. You may see the stereo become enabled, if so mark
this
point with a thin magic marker, continue tuning this adjustment
until
you once again loose stereo, mark this point. Now set VR03 to the
mid point of these two marks and you should be all set. If this
does
not resolve the problem I suggest taking it to your local
technician.

Sincerely,

Ken Bernacky


Re: Pioneer F-26 What is it worth?

sedond
 

wpfw is not a npr station, & it doesn't take a penny from "corporate
sponsors".

your point, tho, is well-taken...

doug s.

--- In FMtuners@yahoogroups.com, Don O'Brien <dobrien25@c...> wrote:
I beleive that the CPB and the gov't. are forcing all NPR stations to
convert to IBOC/HD digital radio broadcasting. I'd suggest calling
them up
and tell them you refuse to give money unless they do not convert to
digital.

http://www.cpb.org/grants/digitalradioconversion/

At 07:22 PM 05/24/2005 -0000, you wrote:
90% of my listening is to one single fm station. (wpfw, 89.3 in
wash., dc - they are having a fund drive, ending tomorrow - SEND THEM
MONEY!!!) i am sure they will be around for at least ten years, if
not longer, in their present format. so, a $1500 investment in a tuna
is *easily* worth it. *that's* what common sense tells me.

ymmv,

doug s.


Advice on Modifying (DIY) Sansui TU-X1

ramat51 <moshe.cohen@...>
 

Dear All,
I would appreciate if you can help me on modifying advices for SANSUI
TU-X1 that further improves its sonic performance.
Including:
- Upgrading coupling/decoupling "capacitors" (to Black Gate or
equivalent.)
- Other upgrades.
I have schematic diagram hence I appreciate if you indicate names of
components and values.

Thanks in advance,
Moshe


Sony ST-S730ES

John Robinson
 

How bad is the frequency drift in this model? Does anyone know how it
can be fixed.


Re: What is a "romantic tuner" ?

Tom
 

The KT-7500 becomes more romantic if you dim the lights ;-) I used
#53 lamps colored blue with magic marker.

Tom
--- In FMtuners@yahoogroups.com, "newaag" <bob@f...> wrote:
I think our format is pretty much locked in for now.
In general, I think most of the tube tuners tend be "romantic"
sounding.
And I can't say why. I used the term to describe what I hear from
the
KT-8005 tuner.
What do others think?

-bob
--- In FMtuners@yahoogroups.com, "freedom221988" <holtuniverse@m...>
wrote:
I often get this warm or warmer and relaxing feeling when
listening to
music through my audio. "Seducted by" may be appropriate. Some
tuners just have that extra ability, some compositions, as well
and in
combination. Just a WHY NOT suggestion there be a category for
"Romantic Tuners" or has this been addressed previously and
completely? Is a Shootout for this possible, or review and
reclassify
the existing information enough or not of interest the group?


tandberg-tuner 3001 vs. 3001a

michael <tonihormoni@...>
 

here in the forum are a handful owners of the Tandberg tuner 3001, as
I suspect.

some informations about it:

originally the device had the name (TPT) "3001", above the serial No.
700 the name did change to "3001A". the 3001 had a silver case, the
3001A came into a black case. a "cross-over"-design like the
3001/3001A-tuner, seen this week in ebay (black front-plate, rest of
the case silver), I did never see before.

the Tandberg gets rather warm at the power supply. therefore by all
appearance Tandberg experimented with the design for the ventilation
("chimney-effect"), so that there were two variants of the the upper
lid of the (3001A) case (see also: http://www.nrhf.no/nrhf-TR.html ).

in the course of the production series altogether 7 modification steps
appeared at the tuner, and not two, how the switch of the items name
from "3001" to "3001A" suggest. nevertheless the change of the name
is justified, because above serial No. 700 new boards were used for
decoder and limiter (the decoder-design: easily modified; the
limiter-design: strongly modified, in particular what concerns the
transistor-design).


the modifications in detail*:

(A) circuit: tuning system 1

above SN 400:
- R946 changed from 12k to 4k7
- R948 and R951 changed from 220 Ohms to 1k8
- R931 disconnected from P1001, pin 3, and connected to U906, pin 6

above SN 600:
- R940 changed from 10k to 18k
- R936 changed from 2k7 to 5k6
- CR911 replaced by a strap
- R938 changed from 60 Ohms to potm. 2k5

(B) circuit: tuning system 2

above SN 400:
- Pin11 at U1003 disconnected from R1017 and U1004, pin11, and
connected to ground

above SN 550:
- R1007 changed from 820k to 220k


( C) circuit: main board

above SN 500:
- Potm. 752 changed from 1M to 6M8
- R401 changed from 10k to 33k
- R405 changed from 47k to 100k
- R406 changed from 47k to 33k
- R408 changed from 3k3 to 2k7
- R426 changed from 1k5 to 1k
- R427 changed from 15k to 33k
- R739 changed from 2k7 to 3k9
- R732 changed from 33k to 27k

above SN 850:
- Q401/402/403/404 changed from Siemens to Motorola


( D) decoder:

above SN 400:
- Q504 changed from BC559B to BC490B


above SN 900:
- Q605/606 changed from Siemems to Motorola
- check that C530 is 68pF with U504 from Motorola, and 82pF when using
U504 from SGS

( E) limiter: modified circuit board, above SN 700

( F) selectivity: modified circuit board, above SN 700

( G) power:

CR808 and CR812, 6.8V, changed from Siemens type to Motorola (cause:
inaccurate zener voltage)

(* see also: tandberg-service manual, p. 35)

---


for DIYers

who would like to restore himself should take hold into the eyes an
exchange of the caps C627 and C628 (only drop of bitterness: the
available height amounts about 21 mm merely. therefore you can use
only standard caps - i.e. from black gate - but not the higher grade
types from the same manufacturer).
you also could replace the 5 cement-resitors in the power supply
against MOX types.

On my tuner I have found only one deviation from the schematics-diagram:
C501 should be - according to the diagram - a 22uF/35V Elna-type; on
my item it's a 47uF/35V Elna-Cap.


for a good 3001-item there are – on the long run - known only three
problems:
- the heat (he always must stand "free")
- the contacts from the bridge between decoder and output; you must
clean and de-oxidize them in an interval from 4 or 5 years
- and finally the presets: these must be replaced approximately every
10 years as it is known

by the way I don't know how many Tandbergs were build.
It would interest me therefore whether one owner in this forum has a
model with a SN above 1000? My own tandberg 3001 is a very early item
and has the SN "00042".

best regards - mikel