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Common, Rare, Odd, & Obscure Amplifier Poker

GordonW said:
Surprised no one has mentioned the very unusual Stromberg-Carlson ASP-422. The only amp design I've seen, that used the 6DY7 output tube. Basically, a 6DY7 was like two EL84 tubes in one bottle- about 15 watts from a single tube in PP.

I had one of these that I restored here, but can't find a picture from that one- however, here's a picture of one from Tom Bavis' web site:

SC433.jpg


It's a pretty stout little amp- more power than an ASR-433, by a bit. I think that's probably due to the output transformers being a bit heftier than the '433...

Regards,
Gordon.
Click to expand...

Oooh! What a beautiful little amp.
 
Back in April, I saw this strange little "Northpoint" brand amp at the Oldsmar Flea Market outside Tampa, FL. Looks like it it might have a 6CA4 rectifier, two EL84's and a 12AX7. Manufactured by "U.S. Audio" in Bronx, NY, I think it might have been sold under "Shell" and other brand names. I was curious about this amp until I saw the $190 price tag. I'm glad I held off because a couple months later I got the beefier Realistic SAF-40D for $2 less. I wonder if this obscure little amp is still sitting there...
 

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stormking said:
Nice little pair of Pilotone AA-903's from the mid 1950's. 6V6 powered for a mighty 10 watts. Slight differences between the two even though they aren't far apart in serial #s.
Maas Rowe & Pilot by , on Flickr
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That's the same amp circuit (from the 6C4 onward) as the Pilot AA-902 schematic, that I based some of my custom build amps on. I modded it so that the volume control was between the 6C4 and the 12AU7, and changed some resistor values to get more bias current through the 12AU7 and such, but it's a great basis for a nice amp...

Regards,
Gordon.
 
Both like the first one.

I bought them a few years ago: one in New England and the other 6 months later in the midwest. As luck would have it the serial numbers are four numbers apart. What are the chances of that some 65 years later!
 
I was searching some info and this long dead thread came up. Still one of my favorites, bump for the newer members. Please add more.
 
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