In Reply to: Building clone amp - question about grid resistor and coupling cap posted by PeterI on June 21, 2021 at 09:25:55:
I couldn't help but notice in the schematic the unusually high 60 volt drop on each side of the output transformer, and the resulting 375v on the screen - 75v above the rated maximum and quiescent G2 60 volts greater than the plate.
The high DC resistance of the output transformer might indicate a high inductance for deeper bass in a small transformer, at the price of greater power loss. If the quiescent current is 40mA, the DCR would be 3000 ohms plate-to-plate.
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Follow Ups
- High G2 voltage - Paul Joppa 06/22/2114:15:30 06/22/21 (13)
- Not sure that's right... - Ivan303 15:21:50 06/22/21 (11)
- The HF-81 looks much better, but ... - Paul Joppa 17:03:23 06/22/21 (10)
- Not sure it's an EICO HF-14 schematic... - Ivan303 18:33:39 06/22/21 (9)
- RE: Not sure it's an EICO HF-14 schematic... - Paul Joppa 09:41:04 06/23/21 (0)
- RE: Not sure it's an EICO HF-14 schematic... - Tre' 18:55:05 06/22/21 (7)
- RE: Not sure it's an EICO HF-14 schematic... - Ivan303 20:10:30 06/22/21 (6)
- RE: Not sure it's an EICO HF-14 schematic... - Tre' 07:06:14 06/23/21 (5)
- RE: Not sure it's an EICO HF-14 schematic... - PeterI 08:02:28 06/23/21 (4)
- Watch Out for SAM! - Triode_Kingdom 08:47:38 06/23/21 (3)
- Strangely, here's the Eico manual schematic: - PeterI 08:55:44 06/23/21 (2)
- YES! The Self-Powered Output Transformer! - Triode_Kingdom 10:28:12 06/23/21 (1)
- A long time ago! nt - Tre' 16:12:21 06/23/21 (0)
- RE: High G2 voltage - Tre' 14:34:33 06/22/21 (0)