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My vintage ST-70 needs new tubes
ferpromo- Posts : 3
Join date : 2020-08-26
mijohn- Posts : 119
Join date : 2013-06-19
The right front EL34 tube in particular is obviously kaput as it has lost its vacuum!
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anbitet66- Posts : 143
Join date : 2009-12-23
Location : Valley Stream, NY
And the right rear looks to have run so hot as to have consumed most of the getter flash. That side may have a bias issue caused by leaky coupling capacitors.
This is an amp that will greatly benefit from a simple re-cap and a set of output tubes. Though, a more thorough going over would be nice, but in many cases not needed.
I have a vintage unit that is all original, 'cept the output tubes on one side and she still biases and sounds fine. A new quad cap is on the horizon just in case.
Good luck with it. Tony
This is an amp that will greatly benefit from a simple re-cap and a set of output tubes. Though, a more thorough going over would be nice, but in many cases not needed.
I have a vintage unit that is all original, 'cept the output tubes on one side and she still biases and sounds fine. A new quad cap is on the horizon just in case.
Good luck with it. Tony
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ferpromo- Posts : 3
Join date : 2020-08-26
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