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As I remember this power stage works well with 6l6gc , and even with 6P3S with 100ohm into the screens - within screen power dissipation limit. I modded one...
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Well...is more than 50mV.peak. I get a random measurement with my dmm which shows 50mV AC. F3 is first and second stage, F2 is third stage and inverter F1...
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DC heaters
Hello. I ask for a solution to a DC heater problem as follow please:
Have 3 heaters to supply from an independent heater supply source. The first heater...Last edited by catalin gramada; 03-27-2024, 08:57 AM.
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I.ll say get lost of bjas resistors in power cathode in this amp. They will induce local feedback with unwanted effects, specially in a shared configuration...Last edited by catalin gramada; 03-21-2024, 02:57 PM.
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I just wondering why should the bias be individual adjustable ? Even the triodes are not balanced the second one is tailored for gain 1 by feedback resis...
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And one more question regard the proper wiring of negative supply circuit. May I use both versions without the risk to get into a ground loop please ? Thanks....Last edited by catalin gramada; 02-05-2024, 02:25 AM.
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Thanks.Dirty sketch of actual circuit. I may remove cathodes resistors and insert the bottom of grid resistors directly into -8v negative supply instead of...Last edited by catalin gramada; 02-03-2024, 07:51 PM.
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Triode fixed bias vs cathode bias diferences
Hello. I have the weird ideea to bias my drivers (ecc99) in the grid with negative voltage provided by same negative supply for power tubes. Should I expect...
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Yes, right, first one is not part of dc operation, thanks. One more please: the capacitor max ripple current is specified as peak or rms current please ?...Last edited by catalin gramada; 12-31-2023, 04:01 AM.
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Hello.
Because my winding have just 0.2 ohm resistance I tried a diversion to limit the charging current and I instaled one ohm resistor between bridge...Last edited by catalin gramada; 12-28-2023, 10:46 PM.
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And think I may answering myself. The minimum noise I can get with a mix of dc and substantial 1v ac ripple was with the negative tied to ground. But again...Last edited by catalin gramada; 12-27-2023, 05:40 AM.
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There are no evident problems in both instances. That mean both variants of grounding are correct and no one take advantage over the other ? So, there is...Last edited by catalin gramada; 12-26-2023, 09:01 PM.
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Here is the speaker output with all controls dimmed. There is still no sign of 100hz ripple....
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I measured the output of first stage. Well...with my 1x probe on 2mV scale I cannot see any ripple on plate...it's a straight line, the instrument have not...
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I don't have such of sensitive rig to precise measure the coupling into the stages to see a diference. Then, how I may do a difference between plate supply...
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I used pair of 15mF/25V, two filtering stages With a 7.5 ohm resistor it drop right on 6.3V loaded for 0.95A. I splited the resistor in couple of pieces....Last edited by catalin gramada; 12-27-2023, 12:49 AM.
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Well a 100cps ripple will make more noticeable perceived noise than 50cps do.
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