General discussion area for tube amps.
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Travis8
Posts: 51 Joined: Sun Aug 08, 2021 8:47 am
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by Travis8 Tue Aug 10, 2021 12:49 pm
Stevem wrote: ↑ Tue Aug 10, 2021 10:27 am
On your 3rd output tube socket from the left it looks to me from your last photo that pin 3 is shorting to pin 2 .
I check It and there is not sorts
Violet to chasis and yellow to chasis around both 0.6 vdc
Last edited by
Travis8 on Tue Aug 10, 2021 2:04 pm, edited 1 time in total.
pdf64
Posts: 2932 Joined: Sat Mar 12, 2011 9:23 pmLocation: Staffordshire, UK
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by pdf64 Tue Aug 10, 2021 1:17 pm
Travis8 wrote: ↑ Tue Aug 10, 2021 12:49 pm Stevem wrote: ↑ Tue Aug 10, 2021 10:27 am
On your 3rd output tube socket from the left it looks to me from your last photo that pin 3 is shorting to pin 2 .
I check It and there is not sorts
Violet to chasis and yellow to chasis around 0.6 vdc
Oh yes, it would be, so many posts!
Travis8 wrote: ↑ Mon Aug 09, 2021 5:07 pm
Fuse it's okey, pin 8 of rectifier 0.640 vdc
It looks like your GZ34 rectifier may be bad.
Does it get hot?
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Travis8
Posts: 51 Joined: Sun Aug 08, 2021 8:47 am
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by Travis8 Tue Aug 10, 2021 1:55 pm
It's sovtek 5AR4 I turn on and wait some minutes.
Travis8
Posts: 51 Joined: Sun Aug 08, 2021 8:47 am
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by Travis8 Tue Aug 10, 2021 3:54 pm
In summary:
pdf64
Posts: 2932 Joined: Sat Mar 12, 2011 9:23 pmLocation: Staffordshire, UK
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by pdf64 Tue Aug 10, 2021 3:59 pm
Either the HT fuse, the rectifier valve, or related connection, is bad.
https://www.justgiving.com/page/5-in-5-for-charlie This is my step son and his family. He is running 5 marathons in 5 days to support the research into STXBP1, the genetic condition my grandson Charlie has. Please consider supporting him!
Travis8
Posts: 51 Joined: Sun Aug 08, 2021 8:47 am
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by Travis8 Tue Aug 10, 2021 4:02 pm
pdf64 wrote: ↑ Tue Aug 10, 2021 3:59 pm
Either the HT fuse, the rectifier valve, or related connection, is bad.
3 1/2 pages to get here, yikes!
I try it with new fuse, maybe it´s rectifier valve.
How can I check it before buy one?
sluckey
Posts: 3528 Joined: Sun Jul 22, 2007 7:48 pmLocation: Mobile, AL
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by sluckey Tue Aug 10, 2021 4:13 pm
Travis8 wrote: ↑ Tue Aug 10, 2021 4:02 pm
I try it with new fuse, maybe it´s rectifier valve.
How can I check it before buy one?
Take the fuse out. Measure the VDC on pin 8 of the rectifier tube.
Travis8
Posts: 51 Joined: Sun Aug 08, 2021 8:47 am
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by Travis8 Tue Aug 10, 2021 4:24 pm
Around 90-100 mV without fuse
sluckey
Posts: 3528 Joined: Sun Jul 22, 2007 7:48 pmLocation: Mobile, AL
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by sluckey Tue Aug 10, 2021 4:51 pm
sluckey wrote: ↑ Tue Aug 10, 2021 4:13 pm Travis8 wrote: ↑ Tue Aug 10, 2021 4:02 pm
I try it with new fuse, maybe it´s rectifier valve.
How can I check it before buy one?
Take the fuse out. Measure the VDC on pin 8 of the rectifier tube.
Just to be crystal clear, I'm talking about taking out the HT fuse.
Travis8 wrote: ↑ Tue Aug 10, 2021 4:24 pm
Around 90-100 mV without fuse
If you removed the HT fuse then that rectifier tube is dead.
Travis8
Posts: 51 Joined: Sun Aug 08, 2021 8:47 am
Post
by Travis8 Tue Aug 10, 2021 4:59 pm
sluckey wrote: ↑ Tue Aug 10, 2021 4:51 pm sluckey wrote: ↑ Tue Aug 10, 2021 4:13 pm Travis8 wrote: ↑ Tue Aug 10, 2021 4:02 pm
I try it with new fuse, maybe it´s rectifier valve.
How can I check it before buy one?
Take the fuse out. Measure the VDC on pin 8 of the rectifier tube.
Just to be crystal clear, I'm talking about taking out the HT fuse.
Travis8 wrote: ↑ Tue Aug 10, 2021 4:24 pm
Around 90-100 mV without fuse
If you removed the HT fuse then that rectifier tube is dead.
Yes, I remove the fuse and that was the VDC
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Travis8
Posts: 51 Joined: Sun Aug 08, 2021 8:47 am
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by Travis8 Tue Aug 10, 2021 5:00 pm
sluckey wrote: ↑ Tue Aug 10, 2021 4:51 pm sluckey wrote: ↑ Tue Aug 10, 2021 4:13 pm Travis8 wrote: ↑ Tue Aug 10, 2021 4:02 pm
I try it with new fuse, maybe it´s rectifier valve.
How can I check it before buy one?
Take the fuse out. Measure the VDC on pin 8 of the rectifier tube.
Just to be crystal clear, I'm talking about taking out the HT fuse.
Travis8 wrote: ↑ Tue Aug 10, 2021 4:24 pm
Around 90-100 mV without fuse
If you removed the HT fuse then that rectifier tube is dead.
I'm going to buy new one (5AR4) and try It.
sluckey
Posts: 3528 Joined: Sun Jul 22, 2007 7:48 pmLocation: Mobile, AL
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by sluckey Tue Aug 10, 2021 5:19 pm
BUY A GZ34 TUBE!!!
Travis8
Posts: 51 Joined: Sun Aug 08, 2021 8:47 am
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by Travis8 Tue Aug 10, 2021 5:20 pm
sluckey wrote: ↑ Tue Aug 10, 2021 5:19 pm
BUY A GZ34 TUBE!!!
And, you don't have to remove the entire fuse holder just to remove the fuse. That's kinda like removing the tube socket to remove a tube!
I didn't remove the fuse holder, just the fuse! XD
Ok I will buy one 5AR4 like the ones it's bad
sluckey
Posts: 3528 Joined: Sun Jul 22, 2007 7:48 pmLocation: Mobile, AL
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by sluckey Tue Aug 10, 2021 6:23 pm
Travis8 wrote: ↑ Tue Aug 10, 2021 5:20 pm
I didn't remove the fuse holder, just the fuse! XD
Phew! That's good. My mistake.