Electro voice ev66

[danielphanto]

Hello,

I picked up an old Electro Voice ev-66 integrated amp. It turns on with dim bulb 45 Watt only slightly glowing.
I have 4 volts offset on one channel and about 280mV on the other.

I have been looking for a schematic for this item with no luck. I did find some info on it in an engineering paper which shows a block diagram.

It is going to be a project for myself, not a lot of money invested in it. I want to look at the "good channel" and compare voltages from one channel to the other at the same reference points.

There are a lot of electrolytics on these boards from the mid 1960s. I believe there is a mix of germanium and silicon transistors in this unit.

Thanks for any input anyone might have,

Daniel

 

[Tom B]

I am very familiar with early EV units. Never heard of the ev 66 integrated amp.
But I do have a service manual for an EV1244 integrated amp from the 60's It uses PNP germanium outputs and the rest of the transistors are silicon. Early design using PNP outputs that are transformer coupled from the drivers. I'll attach some pictures that may help

 

[danielphanto]

thank you, I'll post some pics and see if it rings any bells.