stevem Messages: 4738 Registered: June 2004 Location: NY
Senior Member
Hi!
There are two different early models, a 25 watt 1965 to 66, and a 100 watt model.
The 100 watter has two big power supply filters of the same value, is this what you have ?
What are the date codes on the pots as that can help to pin down the model also?
stevem Messages: 4738 Registered: June 2004 Location: NY
Senior Member
Yes, you have the 100 watt model which is good news since we have the schematics for that on this site.
On our main page go to the technical section , the go to amps by model number.
Then scroll down about half way and click on the listing for ( K200A all )
stevem Messages: 4738 Registered: June 2004 Location: NY
Senior Member
Hi!
Diodes D1 thru 4 produce a DC voltage across the pilot lamp ( I302) and the two big main filter cans / caps.
With your meter set to read DC volts you should find about 40 volts positive across cap C3 and a negative 40 across cap C4.
You should find that same negative 40 volts on the non resistor side of that pilot lamp I302.
If you have voltage there then that lamp which is a type 1849 bulb is bad.