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Post subject: Pro Jr worth fixing
Posted: Wed Sep 20, 2017 8:04 pm
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I bought a used MIM Pro Jr around 5 yrs ago. Yesterday when I turned it on there was a loud buzz and then no power. It's like the on off switch blew. Is it worth fixing? I'm going to try googling too to see what it is and if it's worth fixing but I'd thought I'd start with the forum.


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Post subject: Re: Pro Jr worth fixing
Posted: Wed Sep 20, 2017 10:20 pm
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Sorry for dumb question. I googled and I think it's the fuse. I'm going to try that. Fuse is a Buss AGC 2A, 250 V.


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Post subject: Re: Pro Jr worth fixing
Posted: Thu Sep 21, 2017 9:53 am
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Location: Province de Québec, Canada
If new fuse blow, remove output tubes and try new fuse without output tubes.
If fuse don't blow, replace output tubes. One or two are bad.
if fuse blow see a qualified tech


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Post subject: Re: Pro Jr worth fixing
Posted: Thu Sep 21, 2017 9:36 pm
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Wow stratele52 that was it. Tried new fuse and it blew. Took out the JJ el84s and put in new fuse and voila powered up. I had the stock GT el84s so put them back in and amps working. JJs didn't last that long. I swamped to JJs when I upgraded the speaker to a Jensen P10r and all the noise canceling fixes. I don't use this amp that much. Thanks for the help. You're a genius.


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Post subject: Re: Pro Jr worth fixing
Posted: Thu Sep 21, 2017 10:47 pm
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You must check and adjust bias every time you replace output power tubes, if not, new tubes may not last long time.

Or best, you may not have the best tone.


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