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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?

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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

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Old 4th October 2009, 10:20 PM   #3
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Location: Auckland, NZ
in the audiokharma archives... http://www.audiokarma.org/forums/arc.../t-161416.html
"It may not be easy for some to not hear differences, even if they are not there." - Vacuphile,
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