[G E]

Just finished the build of my second Bugle PS, stock except for using +- 12 volt regulators [Digikey #'s 497-1450-5 and 497-1475-5, yes the pin-outs match Jim's original spec].  My output voltage is fine at +11.8 vdc and -12.02 vdc. 

But the voltages across the 4700 uf caps are higher than expected, measured across the leads of each cap:

C1 = 27.93 vdc
C2 = 27.70 vdc
C4 = 27.48 vdc
C5 = 27.68 vdc

I expected to see 20 vdc across C1, C4 and 18 vdc across C2, C5 per the schematic.  I am concerned about exceeding the caps' voltage rating (25v), ie -long term reliability or catastrophic failure.

Voltage at the mains is 123-125 VAC, across the the secondaries pins 11-12 is 21.4 VAC and about the same across pins 13-14. 
The no load voltage spec for the 70023 transformer is 2 x 21.3

All voltages are without the Bugle Phono preamp attached.

All resistorss and diodes were measured and verified prior to installtion and a lighted magnifying glass was used to confirm no solder bridges, cold solder joints etc.  Resistor values/placement were reconfirmed after the build.  Capacitor polarity is correct.

Any ideas and suggestions?

Greg

[poty]

It seems the quiescent load is too low. It is defined by R6 and R9 (and R3-LED, R10-LED if present). You should lower the R6, R9 to meet the minimal load requirements.

[hagtech]

Yes, that is a bit high voltage for the input caps.  Is that with the stock tranny?

jh

[poty]

Is that with the stock tranny?

...the 70023 transformer...

Voltage at the mains is 123-125 VAC

is a bit high comparing to the spec (115V), so

The no load voltage spec for the 70023 transformer is 2 x 21.3

should be (125/115)*21.3=23.15
For no load (almost) the voltage across the caps is near the amplitude of the secondary voltage, not RMS (23.15*1.4=32.41). Then you should increase the load (lower the bleeding resistors) to achieve the right behaviour of the rectifiers' filters.

[G E]

Yes, that is a bit high voltage for the input caps.  Is that with the stock tranny?

jh

Jim,
yes, these voltages are with the transformer as spec'd in the original parts list. I got it from Jack.

Jim, please advise any other voltage measurements I sbould take or other options.  Please be specific as I am a kit hobbyist, not an engineer

thanks for the help!

Greg

[jcg0322]

sounds like a solder bridge somewhere.......a very common occurrance