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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Help! Dynaco ST-70 tube glowing cherry red!! posted by Mikey on November 4, 2000 at 11:52:17:
Most common cause in an unrestored ST70 would be a coupling cap (.1uf) going leaky.Swap the two EL34's on that channel and see if the problem follows the socket or the output tube. If it follows the tube, you have a bad EL34, if it follows the socket it probably is the coupling cap or less likely a faulty socket.
If you're running a vintage ST70 unrestored, do replace all of the coupling caps and the selenium rectifier. It is well worth the trouble.
The schematic for the ST70 (and all of the vintage Dynaco tube gear is on my web page below.
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Follow Ups
- Re: Help! Dynaco ST-70 tube glowing cherry red!! - Gary Kaufman 11/4/0016:24:33 11/4/00 (3)
- I swapped the right channel tubes and... - Mikey 09:49:50 11/5/00 (1)
- Re: I swapped the right channel tubes and... - Gary Kaufman 17:01:45 11/5/00 (0)
- Re: Help! Dynaco ST-70 tube glowing cherry red!! - J Harkin 07:54:27 11/5/00 (0)
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