MI-121824 I believe is the model #.

Built for commercial broadcasting application and in continuous use for high-end audio reproduction since. The RCA amps produce 70 Watts per channel of tube power which means that they will power any, and all, high-end speaker systems with ease. Tubes are two Amperex 6146, two Telefunken 12AT7A, two 12AU7, two OC3, one 5R4GY, per amp. All controls are on the front & top of the chassis, including Bias Controls for both the 6146, and 12AU7A tubes with instructions printed on the chassis, two fuse holders, and On/Off Switch. The front panel has connections for Speaker Outputs in 4 Ohm, 8 Ohm and 16 Ohm, and the power connection for 120 volts.

http://i10.ebayimg.com/04/i/06/02/81/f3_3.JPG

http://i10.ebayimg.com/04/i/06/02/81/fd_3.JPG

i know you should send them my way!

WhiteSE,
You gotta stop doing this to us. :)
It´s bad enough to know that there are some of those gorgeous, rare pieces of "Dreamland " equipment in mint condition out there, without you having to throw marvelous pictures of them down our throats. Have mercy on us poor souls. :sigh:

Now, to make my serious case of amplifier envy even worse, please tell me, are you going to get these?
If you are, perhaps I could store your Bernings for a while? :D
Jorge

Jorge...it takes hours of burning time to find something like this...I love the concept of these amps, but I am debating getting them as the sound quality for home audio is unknown,,,,and on the other side, nothing that Craig at NOS Valves couldnt do to improve them...

Oh the dilemmas.

Hey all,

I believe what you have here are some of the old RCA theater amps... Looks like someone removed the barrier strips for rca jacks. Hopefully they left the input circuitry in tact. I have never heard these amps in a home environment only in auditoriums. Keep in mind; the 6146 was designed (and still widely used) for RF transmitter applications (especially ham radio). It will definitely give you some guts.... but not sure if it will give you the "Tube Magic".

just my .02........ :smoke:

-Bill

Oh the dilemmas.

Yeah, I know what you mean.
It´s that sort of dilemmas that make our passion for this stuff so overwhelming, isn´t it? :)
Those amps deserve to be owned by an examplar AKer like yourself. :thmbsp:
Jorge

Edit: Just read Bill´s posting.
I wonder if these babies wouldn´t be better off with me then.:scratch2:
Not that I can afford them, but still.....
Jorge

Yeah, I know what you mean.
It´s that sort of dilemmas that make our passion for this stuff so overwhelming, isn´t it? :)
Those amps deserve to be owned by an examplar AKer like yourself. :thmbsp:
Jorge

Edit: Just read Bill´s posting.
I wonder if these babies wouldn´t be better off with me then.:scratch2:
Not that I can afford them, but still.....
Jorge

I can put you in touch with a very knowlegable gent,formerly from RCA who worked on those amp's development. I've heard his personal pair, and they are indeed sweet. I have one as well, though the layout is a little bit different.

PM me, and I'll make the arrangements. If you want a third, I don't have much hope of finding a mate for mine...:(
cheers,
Douglas

Very cool looking and beefy, I bet they sound sweet or at least can!

I helped my dad do a mild rebuild of an earlier version of one of these, with FOUR 807's for outputs. I have another pair nearly identical too, but with different physical layout, but very similar circuit.

Like some of the Altec Lansing amps of the same era, these are wonderfully overbuilt, but in keeping with the bandwidth of the day, they are down some significant DBs at the very low end. Probably not good for much over 16kz, but I'm just guessing.

Those are not bad to work on, at all.

I have one as well, though the layout is a little bit different.

PM me, and I'll make the arrangements. If you want a third, I don't have much hope of finding a mate for mine...:(

Douglas, does yours use 4 807s? Maybe we have a match!

I've got a pair of these, too and happily, in similar cosmetic condition. These were used for PA applications and are indeed a little light at the low end in stock form; however, if you'll run down a copy of the manual, there are several different frequency response scenarios that you can select for the input circuitry that will improve this immensely. Perhaps this has already been done for yours, evidencing by the addition of the input jack and some other changes. The 6146's will push 70W easily and one of the caveats of these tubes is that you have to have rock-solid voltage regulation, which happily, these amps have. The plate and filament supplies use separate transformers which, on the front barrier strip, have jumpers to switch each of these from a remote location. There may also be (a) relay(s) mounted under the deck to switch the B+ as well, which was an optional feature. My old high school auditorium--Paschal High, in Fort Worth--had a pair of these, mounted in a metal cabinet backstage. They were controlled from a console in the back of the auditorium and could put out a tremendous amount of sound. Always wondered that the purple glow was (the regulator tubes!). The power transformer primaries are also tapped for (I think) 115 and 130V service; you'll note a pair of leads taped and folded over on each one, if you look closely. Enjoy them! They're very conservatively rated, run cool and although 6146's are relatively cheap, they'll probably last forever at nominal listening levels.