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PostPosted: Wed Oct 12, 2011 10:04 pm 
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Joined: Thu Jul 21, 2011 6:49 pm
Posts: 5
I just finished my first amp build -- a TC-15. Everything looks good so far, except a couple of my voltages seem high. All the measurements are with all tubes in.

V1:
1. 112
2. --
3. 1.23
4. --
5. --
6. 112
7. --
8. 1.23
9. --

V2:
1. 154
2. --
3. 1.27
4. --
5. --
6. 284
7. --
8. 163
9. --

V3:
1. 247
2. --
3. 69
4. --
5. --
6. 251
7. --
8. 69
9. --

V4:
1. --
2. --
3. 7.9
4. --
5. --
6. --
7. 381
8. --
9. --

V5:
1. --
2. --
3. 7.9
4. --
5. --
6. --
7. 378
8. --
9. --

V6:
1. --
2. --
3. --
4. --
5. --
6. --
7. --
8. 308
9. --

V7:
1. 63
2. --
3. 1.97
4. --
5. --
6. 103
7. --
8. 1.91
9. --


The ones I'm most concerned about are the pin 7 voltages on V4 and V5, and also V2/pin 6. Nothing else seems too far off. I'm mostly just wondering if those high voltages are bad, or if I need to find some way to bring them down. Can anyone offer some insight?

Thanks

Jake


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PostPosted: Thu Oct 13, 2011 11:09 pm 
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Holy Ghost
Holy Ghost
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Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7436
Location: Brighton, Canada
Compared to this set of recent measurements, it looks pretty good. Have you tried it out yet?

+ 380V AC 119V AC

Pin / Voltage

V1 1/6-127V 3/8-1.46V
V2 1-170V 3-1.5V 6-274V 7-170V 8-171V
V3 1-257V 2-48V 3-70V 6-252V 7-47V 8-70V
V4, V5 Output tubes, screens 232V, plates 376V cathode 8.1V
V7 (EF86) - 1-90V 3/8-1.47V 6-101V

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PostPosted: Tue Oct 18, 2011 11:32 pm 
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Joined: Thu Jul 21, 2011 6:49 pm
Posts: 5
Finally got to try it out tonight. Haven't opened it up yet, cause it's too late. I had some grounding problems with the EF86 channel. Cleared that up, and now all I get (besides the guitar sounds) is some hiss. I suspect that to be the tube I put in. Anyway, it works great, and it sounds even better! Thanks a bunch!


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