Hi.

I have a pair of Altec 1003B horn driven by a 730B with phenolic diaphragm taking care of the 300 - 8K range. I biamp and have a supertweeter to handle the top end. I use a Soundcraftsmen AE-2000 for equalization. I have tried a number of amps with the horn. I recently got a BGW Model 50A on ebay just because I wanted to try a low power SS on the horn. It has now become my preferred amp. I suspect it runs class A for a few watts because it gets really hot without any signal. I checked the circuit, replaced the PS caps. It doesn't look like it's oscillating and the voltages look OK as far as I can tell. The BGW Model 150 circuit is available on line and it looks very similar. Does anyone know any info on the Model 50A or have the service manual?

Thanks
Elias