Heath SP2717A Only Giving 150V, not 400V

[supersonik319]

Originally Posted by Triodethom

look at the schematic and check the res. r15,16,17,18 they all should be 27k . with unit off . Then r11 ,r 13 and r9. Having voltage of 600 plus on the6l6 is good the voltage on the screen in the range .

R15 measures 25.80k Ohms
R16 measures 25.28k Ohms
R17 measures 24.82k Ohms
R18 measures 24.09k Ohms

R11 measures 198.0k Ohms
R13 measures 351.8k Ohms
R9 measures 329.3k Ohms

The expected -300V lines measures -292.2V (measured from cathode of Z10 to anode of Z1).

Because it was low, I measured Z6-Z10, which gave me a result of -143.7V

Would replacing the resistors and zeners with newer, identically spec'd components be the next step?

[Triodethom]

Originally Posted by supersonik319

R15 measures 25.80k Ohms
R16 measures 25.28k Ohms
R17 measures 24.82k Ohms
R18 measures 24.09k Ohms

R11 measures 198.0k Ohms
R13 measures 351.8k Ohms
R9 measures 329.3k Ohms

The expected -300V lines measures -292.2V (measured from cathode of Z10 to anode of Z1).

Because it was low, I measured Z6-Z10, which gave me a result of -143.7V

Would replacing the resistors and zeners with newer, identically spec'd components be the next step?

going with better spec and higher rated will not hurt just a space thing The zeners are not that far off. The resistors do replace as well as the diodes d1 thru 6 with soft recovery diodes{ her108 or uf1007} the originals are 750 ma 600 volt diodes. check r6, r7,r8,r28, replace if off. while at it check the 3 pots zero, 400volt and b+ . also r1 in the top bridge. so far this is a low cost repair.

[supersonik319]

Hey guys, just wanted to share the good news: I finally replaced the resistors and the tube (I just had another 6AU6 tube lying around and thought of giving it a shot) and that did the trick! I now have a fully functional tube power supply for the cost of a few 3W resistors. Thanks for all your help!

[Triodethom]

Great to hear. Which resistors ?

[supersonik319]

Originally Posted by Triodethom

Great to hear. Which resistors ?

R15, R16, R17 and R18, just clipped the leads off and desoldered the stumps, and soldered in new 1% 27k 3W resistors from digikey.

[Triodethom]

Originally Posted by supersonik319

R15, R16, R17 and R18, just clipped the leads off and desoldered the stumps, and soldered in new 1% 27k 3W resistors from digikey.

Glad to hear it running for you.