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Old 8th January 2016, 08:47 PM   #1
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Default Checking 6v6 tubes for damage?

Quick background:

Installed a Weber copper cap (rectifier) and a VVR kit in my 18 watt derived head.

Turned all switches on and measured a B+ that went from 30-ish to 230-ish. Seems good.

Put everything back together, plugged the speaker cable in (key to my question right here) and this time when I turned it on I blew a fuse.

That's when it hit me. I had turned it on without any load.

But I only measured voltages real quick and turned it off. I did not plug in a guitar.

Now I need to know why the fuse blew and I need to know if I damaged the output tubes.

For the fuse - I'm thinking maybe it was simply a matter of bowing down to the extra load from two new devices. I had honestly never specced out the proper size in the first place. The fuse that blew is on the line side of the PT, rated 250v and 1 amp.

But what do I need to do about those tubes?
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Old 8th January 2016, 10:16 PM   #2
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6V6 valves are fairly rugged and unless a high signal is passed through them with no load, they will be fine. Is your mains input fuse anti surge? It needs to be and probably 1.5A Time delay type.
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Old 9th January 2016, 12:29 AM   #3
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Great help! I felt more confident about simply changing the fuse, and that (it appears) was the entire issue. I just played a few minutes and I LOVE my VVR and my Copper Cap.
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