In Reply to: How to know? posted by Yada on April 12, 2010 at 18:07:17:
Measure the voltage across the cathode resistor of the 45 and divide by the resistor value. Make sure you do not include the current drawn by the driver tube. In the ElectraPrint schematic you'd measure across the 10 ohm resistor.
Please remember that voltages and currents inside tube amps can kill. if you're not experienced working with tube ear, please consult a technician.
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Follow Ups
- RE: How to know? - SomeJoe 18:22:07 04/12/10 (19)
- Question about schematic (Electraprint and Welborne?) - Yada 21:34:37 04/12/10 (5)
- Welborne's circuit is somewhat different [nt] - 4season 09:19:44 04/13/10 (0)
- RE: Question about schematic (Electraprint and Welborne?) - drlowmu 21:45:29 04/12/10 (3)
- Electraprint and DRD - Yada 21:50:32 04/12/10 (2)
- RE: Electraprint and DRD - 4season 09:27:26 04/13/10 (0)
- Doubt that. But I don't know. (nt) - drlowmu 22:09:56 04/12/10 (0)
- RE: How to know? - drlowmu 19:18:11 04/12/10 (10)
- Some more questions - Yada 20:32:57 04/12/10 (7)
- RE: Some more questions - drlowmu 21:33:36 04/12/10 (6)
- Jeff, Thanks - Yada 21:48:46 04/12/10 (5)
- RE: Jeff, Thanks - tube wrangler 23:25:43 04/12/10 (0)
- RE: Jeff, Thanks - drlowmu 22:08:12 04/12/10 (3)
- RE: Jeff, Thanks - tube wrangler 23:57:00 04/12/10 (0)
- 7 watts dissapation - Yada 22:24:43 04/12/10 (1)
- RE: 7 watts dissapation - drlowmu 22:45:37 04/12/10 (0)
- RE: How to know? - Yada 19:45:44 04/12/10 (1)
- RE: How to know? - drlowmu 21:37:12 04/12/10 (0)
- What's the downside to trying a 45 tube? - Yada 19:14:24 04/12/10 (1)
- RE: What's the downside to trying a 45 tube? - tube wrangler 00:20:44 04/13/10 (0)