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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: 7189 and 6BQ5 - Plate Voltage and Dissipation posted by FlaCharlie on July 29, 2016 at 10:57:33:
Charlie
The Sherwood S5000 with 7189s runs about 425vdc on the plates and about 420vdc on the screens being an Ultra Linear output trafo.You are correct in that plate dissipation is more critical regardless of where the plate voltage is at..Now keep in mind you don't want a ridiculously high plate voltage even if you don't exceed plate dissipation because you may have arc over issues.I'm talking like 600vdc or more.. If you are at 460v as long as you are biased not to exceed plate dissipation,you will be fine.
The Sherwood S5000 I'm able to squeeze 24wpc out of them with no issues.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 07/30/16
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Follow Ups
- RE: 7189 and 6BQ5 - Plate Voltage and Dissipation - Michael Samra 00:59:31 07/30/16 (12)
- Some Other Voltage Issues - FlaCharlie 08:44:25 07/30/16 (11)
- RE: Some Other Voltage Issues - Michael Samra 00:23:58 07/31/16 (10)
- RE: Some Other Voltage Issues - FlaCharlie 11:47:11 07/31/16 (9)
- And even if it does result in 25% more power, how significant is that really. - Michael Samra 15:02:33 08/02/16 (4)
- RE: And even if it does result in 25% more power, how significant is that really. - pmaneri@samsontech.com 13:15:56 08/05/16 (0)
- RE: And even if it does result in 25% more power, how significant is that really. - FlaCharlie 18:46:46 08/02/16 (2)
- RE: And even if it does result in 25% more power, how significant is that really. - pmaneri@samsontech.com 13:13:23 08/05/16 (0)
- RE: And even if it does result in 25% more power, how significant is that really. - Michael Samra 20:09:11 08/02/16 (0)
- While Many Vintage Amp Mfrs. Abused 6BQ5s, 7189s Take That Abuse Better ! - Interstage Tranny 12:47:33 07/31/16 (3)
- RE: While Many Vintage Amp Mfrs. Abused 6BQ5s, 7189s Take That Abuse Better ! - Eli Duttman 13:07:53 08/01/16 (0)
- RE: While Many Vintage Amp Mfrs. Abused 6BQ5s, 7189s Take That Abuse Better ! - FlaCharlie 16:02:50 07/31/16 (1)
- These are my 7189 tubes and I have 1 quad left and a couple spares - Michael Samra 20:24:44 08/02/16 (0)
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