Aaron wrote: ↑Tue Oct 27, 2020 1:21 am
Have one of these on the bench at the moment. Just finished tracing it. This one has a paraphrase inverter.
Thanks,
Aaron
What a coincidence, I have one on my bench at the moment as well! I think there is a wiring mistake in this one though - perhaps you could help me confirm.
The plate resistor for the second stage is only 10k, and it's also connected to a 100k resistor that goes nowhere... There is a 0.1u cap going from the junction of those two resistors to the next tube's grid.
It still works as is but seems excessively noisy. I'm thinking it's supposed to be a 100k/10k split plate load, with the 100k going to pin 1 and the output signal taken from the 100k/10k junction. Is that what it is in your Monarch?
bobshbob1 wrote: ↑Fri Oct 30, 2020 3:19 am
What a coincidence, I have one on my bench at the moment as well! I think there is a wiring mistake in this one though - perhaps you could help me confirm.
The plate resistor for the second stage is only 10k, and it's also connected to a 100k resistor that goes nowhere... There is a 0.1u cap going from the junction of those two resistors to the next tube's grid.
It still works as is but seems excessively noisy. I'm thinking it's supposed to be a 100k/10k split plate load, with the 100k going to pin 1 and the output signal taken from the 100k/10k junction. Is that what it is in your Monarch?
Thanks in advance!
This is what I traced. This one had an issue with the DC heaters.
Thanks,
Aaron
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+1 for seeing the schematic, I wanna see what the hype is all about.
Going out on a limb and guessing it probably some resistors and capacitors. Maybe a potentiometer or two.
Aaron wrote: ↑Tue Nov 03, 2020 10:01 am
I haven't measured voltages yet, but this is for anyone who needs a schematic for repairs or servicing.
And the Dizzy Bird reverb unit.
Thanks,
Aaron
looking at the Monarch schematic,if you bring down to zero the reverb pot you get zero volume,i guess there should be a resistor in line.
The Vinny model is exactly like the Dizzy without the reverb part.