Re: 468 with no -2450

Chuck Harris
 

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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