Resistance check problem [fixed]

chavac · 6288

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Offline chavac

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Reply #30 on: August 05, 2013, 06:59:30 PM
Will the burnt out led matter?


Offline Paul Birkeland

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Reply #31 on: August 05, 2013, 07:02:10 PM
Not particuarly, I'm looking for the voltages at 1/5 to pop up.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline chavac

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Reply #32 on: August 05, 2013, 07:04:58 PM
Almost identical to the first set I gave earlier, except A6 has a reading as it did in the second set. The led blinks on when I check it too.


Offline Paul Birkeland

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Reply #33 on: August 05, 2013, 07:08:17 PM
Ooo, this is good info, can you pop out the 12AU7 and repeat?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline chavac

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Reply #34 on: August 05, 2013, 07:15:49 PM
Ok here's with neither tube in
1  115
2  115
3  0
4  115
5  115
6  0
7  0
8  0
9  0
10  0
11  0
12  (negative probe)
13  115
14  0
15  115
16  0
17  0
18  45
19  45
20  0
21  115
22  0

A1  115
A2  0
A3  0
A4  0
A5  0
A6  115
A7  0
A8  0
A9  0

B1  115
B2  115
B3  0
B4  115
B5  115
B6  0
B7  0
B8  0


Offline Paul Birkeland

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Reply #35 on: August 05, 2013, 07:25:26 PM
Hmm, there is still a power supply issue, could you pop some photos up of that?  There are a fair number of potential sources, but a photo should make it pretty clear.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline chavac

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Reply #36 on: August 05, 2013, 07:41:34 PM


Offline Paul Birkeland

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Reply #37 on: August 05, 2013, 07:44:30 PM
Can I see the area around the diode bridge?

Is the ground lug by the IEC entry socket soldered?


Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline chavac

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Reply #38 on: August 05, 2013, 07:52:53 PM


Offline Paul Birkeland

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Reply #39 on: August 05, 2013, 08:08:31 PM
Alright, with no tubes in, what is the AC voltage between 18 and 19?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline chavac

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Reply #40 on: August 05, 2013, 08:11:47 PM
Zero


Offline Paul Birkeland

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Reply #41 on: August 06, 2013, 05:52:14 AM
With the power turned on?  Are you 100% sure?

(It's not possible to have 0V AC across these terminals and any DC voltage anywhere else in the amplifier)

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline chavac

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Reply #42 on: August 06, 2013, 01:13:06 PM
Yeah it's zero. Does that mean my transformer is DOA? I can actually see the needle just barely twitch when I touch the probe, but it still settles at zero. I get voltages everywhere else


Offline Doc B.

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Reply #43 on: August 06, 2013, 01:37:06 PM
Is your meter set to measure AC volts when you take the measurement?

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.

Offline chavac

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Reply #44 on: August 06, 2013, 01:46:09 PM
Was it supposed to be? I've been using it set to 500 DC...


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