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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: Misunderstanding here. posted by Michael Samra on May 12, 2014 at 15:01:21:
Not an issue Mike. Figured you meant something else but answer was perhaps too involved....
Incidentally, I use diodes paralleled with the rectifier tube: Voltages take on solid state levels and there;s no slow turn on, but you can run significantly bigger power supply caps. I don't have the diodes soldered in on the photo.
Big no-no for most tube guys but I've been doing this for over a decade with little impact on tube life.
First stage B+ jumps to about 530 so I run a Sprague 20 UF 600 volt cap and then use the choke which feeds three diodes. Two go to a section each of the quad cap and then to the output transformers, the third diode feeds the section (in series with the dropping resistor) of the quad cap feeding the output stage of the 7199. another diode in series the last dropping resistor then feeds the front end of the 7199.
The diode separation really helps the detail and control of the amp. Because the transformer is a bit marginal, the diodes simply prevents the
output tubes from "pulling" voltage from the input stages and keeps the inputs sounding clean. I do it now for all Power supply upgrades and it always helps and adds only a marginal increase in cost, parts wise.
Still have room for larger B+ caps, but the unit sounds pretty respectable with such simple mods and looks pretty much stock.
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Follow Ups
- RE: Misunderstanding . - unclestu 01:38:08 05/13/14 (3)
- RE: Misunderstanding . - Michael Samra 17:20:06 05/13/14 (2)
- Copper - unclestu 20:31:14 05/13/14 (1)
- RE: Copper - Michael Samra 21:39:45 05/13/14 (0)
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