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Old 7th September 2009, 04:29 PM   #1
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Default RCA RK290 console question

I offered to help someone revive an RCA RK290 audio console.

I haven't seen it yet. I'm hoping there is an info sheet/schematic inside like in the good old days, or I'll just have to use my eyes & make do...

Anyone familiar with this?

Thanks
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Old 4th October 2009, 09:19 PM   #2
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Default more info found RCA VCR-84

I went to visit the RCA console today.

I'm thinking out loud below in the hopes someone will agree or disagree with my observations...I haven't really formulated a question yet, other than the unstated 'anyone know where to find a schematic for this?'.

It also said VCR-84 and had a tube chart. I think the RK-### part went with the reference to a reverb feature. (There is no VCR in it!)

So this thing has a 'record player' I'll warn the owner about, a tuner, and amplifier.

The tube chart segregated tubes with a boxed line which implies functional blocks to me.

The 12DT8, 12BE6, 6E5, 12BA6, 35W4, 19T8 and 12AU6 group was pretty clearly the tuner.
---------------------
I'm not sure why the remaining two sections are segregated as they are - but I'll take a guess:
--------------
6CG7, 6CG7 (phono stage/preamp?)
--------------
6BQ5, 6BQ5, 6BQ5, 6CG7, 6CG7, 5U4GB
power amp & power supply?
--------------
It has two hinged speakers, so I'll assume stereo. 6BQ5 = EL84, so that's an output device, but why three? A post on vintageamps.com mentions an RCA amp with 3 power amp sections and reverb...maybe the reverb is an active stage and not a spring thing.

This gives me a gut feeling I would be more comfortable if a found a schematic...or next chance I get pull the back off & see if it HAS one on the cover or inside the cabinet...it DID have the tube chart...

If I have to, I'll just familiarize myself visually & replace electrolytic caps & test the tubes.

I am not familiar with reverb however...

...and I guess I'll just count wires to figure out if the output transformers are SE or PP...given the number of 6BQ5's and number of speakers, I think I'll end up confirming two SE channels (having seen other RCA SE schematics) and scratching my head about the 3rd 6BQ5...

Here goes - I'll try to post...I have some security s/w issue logging in and posting here...and I haven't figured it out yet.

Thanks for following along

Murray
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Old 4th October 2009, 10:20 PM   #3
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in the audiokharma archives... http://www.audiokarma.org/forums/arc.../t-161416.html
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