Where is ak 37 radio power supply In Riders
 

Looking for the shematic for ak 37 radio power supply.

The radio schematic has connectors with note saying to go to page 144 in riders?

A page number and or values to caps will help.
I already tried clicking on several links to other topics in this forum. They always end up going to some goofy page instead.

A rider page number where to find info would be helpful.

I have the data from the AK service book, I'll dig that out.

I'll try to send the sch. I'll still have to dig out the values for the 4 caps.

and the usual bad resistors as well, I *think* 68k and 12.7k

Ok, filter 1 is 1.5uF, filter 2 is 1uF (junction of the second filter choke and the speaker choke) detector filter and RF 1st AF both 0.5uF. As I recall, I used 2uF 600V poly film caps for the first two, and .47 for the last two. Didn't want to have to re-melt all that tar again... The under terminal resistors are 68k (nearest the end) and 12.5K next to it. Values not super critical.

Thanks teevee
 

Ak really didn't like to put cap values on shematics. I may dig into this set next week...

Yup. after all, if the filters failed, you could wire $1.25 to AK and they'd send a replacement!

Also, check the 300 Ohm grid resistors on the back of the tuning caps, a high failure item due to corrosion of the exposed resistance wire...

Thanks for info space control.. great info. I believe the 2nd audio bias resistor shorted 3. Possible bad tube or someone accidentally shorted spkr terminal.
I'm gonna do something different when restored. Might replace bottom plates for cabinet and power supply with geometric metal sheet. Some scopes and other equipment used this to give units ventilation to cool. Mass produced at home depot should lighten this boat anchor a bit.
These unis are made extremely well and shouldn't be discounted. Copper tuning belts with brass wheels well made as AKs are..