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Old 24th February 2017, 04:13 PM   #311
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We all do this as a learning experience right. Now I see the K on my meter. All the readings I used ground at T1. I do have an Alps blue velvet volume control. Aside from V10 pin 7 now reading 9.86 all other readings are the same. I left the meter leads on two to three minutes for caps to charge. Don't know if this makes a difference- PT is Allied 6k7vg, 0PTs are Edcor GSXE 15 8 5s, C11 and21 are Aurucaps .22uf /600 v, R 17 and 27 are Vishay 560 ohm 5w. Thank you w5jag!
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Old 26th February 2017, 04:37 AM   #312
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I wasn't sure if it would help, I tried posting pics of my pcb. My post was denied. Something about security token. I am stuck. Would the pics help?
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Old 28th February 2017, 04:50 PM   #313
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The readings of pin 2 and 7 of the 12at7 will be lower with the volume pot connected but should still read fairly high.

They should also read the same - mine both read 40K with the volume up full.
What does your pin 2 read?

I think you have a short at the volume pot or it may be connected wrongly.
Maybe you should wire it up without the volume pot and check you readings like that.
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Old 28th February 2017, 05:05 PM   #314
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Although you should still get a reading of 100 ohms from the grid resistor.
You need to check around your R22 resistor.
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Old 28th February 2017, 09:59 PM   #315
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Thanks gcom. I'll check tonight.
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Old 2nd March 2017, 10:39 PM   #316
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I removed the board from test bed. Just pc board by its self. The current readings are: V2 pin 8 157.1k ohms, V10 pin 1 162+k ohms, pin 2 and 7 230.7 k ohms, pins 3 and 7 10.2 K ohms, V11 and 21 pins 1 and 8 10.2 k ohms, pins 5 230.7 k ohms. I haven't checked the volume control for shorts yet. I will. Any suggestions of what to check? Thank you for the help.

Last edited by Lee from Chitown; 2nd March 2017 at 10:41 PM. Reason: Auto spell
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Old 3rd March 2017, 04:14 PM   #317
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Default Testing without Tubes

I believe I have read when the amp is powered up you should have speakers or something else connected. Does the same apply when testing with power on and have the tubes out?
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Old 3rd March 2017, 04:28 PM   #318
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Quote:
Originally Posted by Lee from Chitown View Post
I believe I have read when the amp is powered up you should have speakers or something else connected. Does the same apply when testing with power on and have the tubes out?
No. It's fine.

Sent from my SM-G930F using Tapatalk
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Old 21st March 2017, 09:48 PM   #319
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Default Tube Fit

Ahhhh. Went on vacation.
When I got back I checked grounds for the pcb. Ureka! The input I'm using is a 3.5 mm plug. It has four tabs, two channels, common and ground. I wrongly thought the ground would also work for pcb. Added connection. Now my checkout readings are right in line.
Proceeding to power checks. My probes won't fit in V10 socket holes- too big. I tried my tube and it is extremely tight. Like tube is over an eighth of an inch off socket. Is that okay?
( In the mean time I will use micro alligator clips on V10)
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Old 22nd March 2017, 02:54 AM   #320
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Question Help

On to power testing.
I am using three meters. One old (1990s) Radioshackauto-ranging meter with a 400 vac limit.
One new GE 2524 digital 500vac, and one new Allison EM380 digital 600vac meter. Both from Walmart.
Preamp tube pins 4 and 5, and power tube pins 2 read 2.3 vac on the auto ranging meter, and 76.5 on the 200 scale from both other meters.?
On rectifier socket pins 4 and 6 both new meters read 419 on the high scale. Okay.
Rectifier pin 2 reads 1247 on the 500 meter and 13?? on the other.????
My wife was sautéing something in the kitchen- I thought it was the pcb. Maybe I could have. Everything Looks okay.
Meter?
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