Re: 468 with no -2450

Samuel Rocha <py1dkw@...>
 

Hi Chuck and the Group,
Yes, you are correct concerning the Q110B (see picture) and not Q110 as described, my copy was hard to read.
There is an interesting matter, concerning the described out of oscillation before the fuse and transistor blown up, unfortunately first the Q110B and next the 1,5 A fuse:
In order to oscillate, I had disconnected both the home made multiplier and the diode after the secondary. Next, I placed a -4,5 V supply into the base of Q110B and earth. I managed to get a spark from the HV transformer to the HV diode. But if I switched the scope off and on, I had no oscillation, no HV. This was after changing the capacitors.Yes, for a few moments I was happy looking a small horizontal trace, besides having no 15 kV.
Next, I connected a TIP3055 in Q110B place, but no sign of HV, it seems to me I have now two problems together: finding a proper good and old 2N3055 ( easy for me) and find why there is no oscillation (difficult part) . I had checked with another scope and the frequency was 63 kHz when it was working. At least the HV transformer seems to be in good shape.
I think this oscillator is rather hard to work and even worse to repair!
Regards to all,Sam RochaPY1 DKW
.

Em Quinta-feira, 25 de Maio de 2017 21:13, "Chuck Harris cfharris@... [TekScopes]" <TekScopes@...> escreveu:


  AFAIK there is no Q110.

There is a transistor identified as line -110 in the
parts blow up, which is Q1108, as it is also identified
on the schematic. It is listed as being a 151-0140-00,
and as a 36568, whatever that is....

In the tektronix semiconductor cross reference, it is
listed as a type 2N3055H.

It appears among a few other 2N3055H's that each have
different 151 numbers, but the 0140 has the lowest ft,
being 300KHz. The others have ft = 800KHz.

The ft is important, as the transistor is hanging on
a long set of leads, and too high of an ft will help
it to oscillate in the HF bands somewhere.

Most readily available 2N3055's today are a totally
different internal geometry from the low ft type made
back in the 1960's. You may have trouble finding a
new unit. Anything pulled from really old (1960's)
stuff should be fine.

C104 is a popular failure. It is the feedback filter
for the HV regulation loop. I think I mentioned the
possibility a month or so ago, but I forget.

-Chuck Harris

Samuel Rocha py1dkw@... [TekScopes] wrote:

Hi Group!
I had found Q110 in short.
Which transistor should I use for RCA 36568?
Regards to ALL,
Sam





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--------------------------------------------
Em qui, 25/5/17, Samuel Rocha py1dkw@... [TekScopes] <TekScopes@...> escreveu:

Assunto: Re: [TekScopes] 468 with no -2450
Para: TekScopes@...
Data: Quinta-feira, 25 de Maio de 2017, 16:47












Hi Group!

My 468 still gives no sign of -2450v.

I wrote the transistors voltages,It may give you an Idea, I
am working in It for some months already with no success.

Many thanks again

Sam Rocha



--------------------------------------------

Em qui, 25/5/17, Samuel Rocha py1dkw@... [TekScopes]
<TekScopes@...> escreveu:



Assunto: Re: [TekScopes] 468 with no -2450

Para: TekScopes@...

Data: Quinta-feira, 25 de Maio de 2017, 16:00

























Hi Group,







I Have found some diodes 1n4152 and Q533 deffective,
which

were replaced by 1n4148 and BC328.



Now, I discovered that Q109-35495 ( Q1416 in The 465

diagram) is bad.



I need to know which transistor should I replaced It,
better

If It matches the BC/Philips line available in Brazil.



Many thanks again.



Sam







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Posted by: Samuel Rocha <py1dkw@...>
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