This amp will play for about 2-3 minutes then blows the 2 amp fuse. Tubes all test good. I’m confused.
I'm assuming it's been capped including the can caps.
Could be a few things but might be a bad transformer.
Do you hear any loud static just before the fuse blows?
Tony
On 10/3/2023 3:00 PM, Jukebox Repairman via Jukebox-list wrote:
This amp will play for about 2-3 minutes then blows the 2 amp fuse. Tubes all test good. I’m confused.
On 2023/10/03 12:18 p.m., Tony Miklos via Jukebox-list wrote:
I'm assuming it's been capped including the can caps.
Could be a few things but might be a bad transformer.
Do you hear any loud static just before the fuse blows?
Tony
I tend to agree with Tony here, but have one test you can try - remove the output tubes (6V6s or 6L6s) and see if the fuse still blows. A concern is the output transformer may be shorting - see if it warms up even with the tubes removed. If the fuse still pops then find the centre tap of the output transformer and disconnect it and again do a fuse check.
A DIM BULB test would be better for this situation - use a high wattage bulb like 100W and see if it gets brighter after a little while, with the amp powered up and the speaker plug inserted.
John :-#(#
On 10/3/2023 3:00 PM, Jukebox Repairman via Jukebox-list wrote:
This amp will play for about 2-3 minutes then blows the 2 amp fuse. Tubes all test good. I’m confused.
_
No popping. It plays and sounds great until it blows fuse. All caps including filters had been replaced
On Tue, Oct 3, 2023 at 3:19 PM Tony Miklos via Jukebox-list < jukebox-list@lists.netlojix.com> wrote:
I'm assuming it's been capped including the can caps.
Could be a few things but might be a bad transformer.
Do you hear any loud static just before the fuse blows?
Tony
On 10/3/2023 3:00 PM, Jukebox Repairman via Jukebox-list wrote:
This amp will play for about 2-3 minutes then blows the 2 amp fuse. Tubes all test good. I’m confused.
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John Robertson -
Jukebox Repairman -
Tony Miklos