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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: Re: 7189s in Dynaco ST-35 - Ouch! posted by Ivan303 on July 21, 2002 at 07:44:16:
Ivan,If I remember correctly, the 7189A uses a couple pins (1 & 6) which aren't used in the EL84 or 7189, to help dissipate heat off the grids.
The 7189 & 7189A puts out more power than the EL84. Thus requires more voltage, off the PS. If your PS was marginal---plopping the 7189A into your amp probably caused the PS to fail (as you suspected).
You'll need to redo your PS. Reform it. And check the PT for rating. I'd only use the 7189A in an EL84 amp which has over-engineered PT and PS filter circuit.
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Follow Ups
- Re: 7189s in Dynaco ST-35 - Ouch! - steven oda 12:20:37 07/21/02 (9)
- Re: 7189s in Dynaco ST-35 - Ouch! - Bryon 13:30:02 07/21/02 (5)
- Re: 7189s in Dynaco ST-35 - Ouch! - steven oda 17:08:49 07/21/02 (4)
- Re: 7189s in Dynaco ST-35 - Ouch! - Bryon 17:56:38 07/21/02 (1)
- Schematic - steven oda 18:16:55 07/21/02 (0)
- Adden-dumb - steven oda 17:12:57 07/21/02 (1)
- BTW... - steven oda 17:14:05 07/21/02 (0)
- Re: 7189s in Dynaco ST-35 - Ouch! - Ivan303 12:49:18 07/21/02 (2)
- Re: 7189s in Dynaco ST-35 - Ouch! - steven oda 13:27:12 07/21/02 (1)
- Great - Thanks (nt) - Bryon 19:08:44 07/21/02 (0)
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