interesting modulator driver ?

[Opcom]

Picked up this small amp today. Four 6V6's in PP Par. Unfortunately it has been very bastardized and the result was a burned out power transformer. I can replace that. But what is so strange is the circuit.

I keep looking at it, and wondering where the input for the 6V6 grids is.
Is it an amp at all? If not, what is it?

[K4TLJ]

Siren? Audio frequency power oscillator?

[k4kyv]

The thing I would question is the .002 1600v  capacitor across the primary of the output transformer.

Siren? Audio frequency power oscillator?

You're right.  I overlooked that the input and output transformers are the same transformer.  This is obviously not a wide frequency range amplifier but some kind of oscillator.

[WQ9E]

Perhaps the recording bias and erase oscillator for the Jolly Green Giant's tape deck?   

[W7TFO]

With the output ability of a quad of 6V6's, I'd say it was for driving either an AC motor or some type of resonant inductive device.  Ampex used a similar scheme for variable speed on tape decks.

[WBear2GCR]

Pull the grids off that output xfmr's second winding, bias them, (I'm not a self bias fan in power stages...), xfmr couple that and you may have a good audio power amp... or modulator...

         _-_-

[KB3DKS]

Pat,
  Are you sure that the output transformer can contains ony one transformer?

I have a couple unknown mfg. transformer units that actually contain two transformers. One of them has a power unit and a choke while another has what could be an output and driver mounted as non coupled.

Bill,
KB3DKS in 1 Land

[Opcom]

I don't know anything about the transformer yet. It is interestingly rectangular. Time permitting, I can supply B+ and 6.3V from an adjustable regulated power supply and see what happens. The one windng there with such a low DCR I would guess I should swamp with a 10 ohm resistor or so in case anything takes off.

[DMOD]

I think it's either a an Old Civil Defense siren driver or a sonar driver.

Phil - AC0OB

[w4bfs]

the 5 pin connectors were used in electronic organ accessories .... the sharing of a core might have been some sort of cost reduction along with negative fb ... a lot of Hammond amps used pp-parallel 6v6's ....just a possibility ...73 ...John

ps ... I STILL wanna shop at Patricks' sto