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I'm following Stephens start up procedure. The Rect and power tube sockets measure correct with only a rectifier tube installed.

Only the preamp tube socket pins are measuring 365!!!

anyhoo, I'll take some photos.

If anyone has any ideas, much appreciated.

Thanks

So I searched the forum for potential answers and took a few more measurements.

First - the tranny never got hot & nothing ever smelt like burning...

With no tubes installed, pins 1 & 7 of the rectifier tube sockets read 270 each & 590 across the 2 pins.
the heaters all measure 6.63 across.

I install the rectifier tube & connect a speaker. turn on the amp & flip stand by
When I measured the filter cap tabs, they both read 364.

Any ideas?

No current is flowing through the circuit. Install the tubes. Then try again.

If the tubes are actually installed, What DCV are the cathodes pin 3, 8 measuring? Sounds like no current is flowing ithrough V1.


Rest sounds good.

_________________
Stephen
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v1 pin 3 .861
pin 8 .867
pin 1 is in 142

I measured all voltages with the tubes in. Most were within 10% of what's in the layout.
the curious ones were on v2....p1 145 p3 2.67 p6 249 p8 26

Im going to triple check everything tomorrow.

thanks again

ac mains 290vac
B+ no tubes installed 364 vdc
B+ all tubes installed 314 / 294 vdc

v1 p1 145 p3 .887 p6 143 p8 088
v2 p1 145 p3 2.67 p6 249 p8 26.4
v3 p1 197 p2 47 p3 68 p6 195 p7 47 p8 68
v4 p3 10 p7 306 p9 296
v5 p3 10 p7 306 p9 296
v6 p1 289 p315 p7 288

Yay - solved the issue with v2 - broken wire!

Now if I can just figure out why the B+ on the filter caps is low.

The amp sounds great, the trannies don't get hot, but he low voltage worries me.