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If your ready to hunt here is a list of televisions produced by RCA listed by years which helps to limit scope.
nosaj

This guy has a schematic lists as
RCA VICTOR PTU-1 PROJ.TV AMP MI-6599 '48 SER $22.00

http://www.agtannenbaum.com/r_cat.htm
Now if we could figure out the exact model...

The very first amp I started with was an RCA MI- something (MI for Master Index number) It was a 40's amp 2 6v6's
I think I was told it was a parallel SE amp. It was a hot little amp just the way it...

Good job Randall and thanks for posting in the way that you did showing steps to figuring out issue May it help some other tech.

nosaj

It's a shame he had the tools to figure it out , just needed a dummy load. The sig Gen would've ruled out the guitar. Hopefully we will hear the final result of this.
nosaj

Guitar electronics half a volt of electricity Vs Amp Electronics hundreds of volts of Electricity.

That's like saying I'm a painter I can paint cabinets(and I do at work) but I ain't no Van...

Couple of other factors here that are possibilities, type of guitar pickups(single coil, active or what?) Overloaded inputs are easy to feedback.
nosaj

Jack Darr's book covers some of what signals look like on a scope also. Do yourself a favor and read the book. It may be old but it is a wonderful resource written in easy to read language even for...

Your posts always are so well articulated sometimes it reminds me of Mr Wizard's World.
nosaj

I would suggest hooking the scope up to the signal generator and then playing with the knobs to get a feel for how things should operate.
For one you won't be learning how it operates near high...

TV screens only.

nosaj

How about some TP data? Specifically at TP1 and from there we can work down. Are you going to put the square wave back in the circuit?
What were original transistors?
nosaj

I would check with https://www.simplyspeakers.com/Roland_bymfg_94-0-1.html
If it doesn't look like any of these call them and they will surely get you set straight. Great company and willing to...

This may help get you on the right track
56050
nosaj

If you ride the ass backwards you will see where you've been and what you should have done said or not argued about. Pointless drivel arguing semantics.

Nosaj

Do you have various parts in candy dishes around the house for when a tech swings by to say hi? 😁
Nosaj

See if Vintage Vibe canhelp you.https://www.vintagevibe.com/
nosaj

Some things I do.
Glad it worked out.
Nosaj

I WANT PICS please please :)

nosaj

Far left side of schematic by edge between c and d markings on schematic side.

Q103 is for 48v phantom voltage.

nosaj

Good deal, I knew one day someone might need them. For some time I was collecting all the organs in my area people were getting rid of and deconstructing them.. Boo to the naysayers it was me or the...

You're welcome. Compassion has never been a strong suite for me, especially if you ask my wife.
Nosaj

Well it sucks, but it's time to pay the Piper. Go to the old folks s home an see the guys with emphysema, can't get much worse than that. But I will say if you are looking for a settlement kind of...

Well let's see you've been provided the MSDS twice now an multiple suggestions of using a fume extractor for soldering, multiple people telling of breathing problems an having wished they'd have done...

What should proper orientation of a fan be in a powered mixer? Blowing in or pulling out?

Got a chinese one here that blows in, my thoughts are it should blow out sucking air from vents in the...

Hey man we're not trying to run the world here or anything like that. 😎
Nosaj

No Spicolli was a character in fast times at ridgemont high. Surfer dude played by Sean Penn.

Nosaj

Holy Spicolli!!!

nosaj