Why 10k in-series with primary side of reverb driver tranny?
Moderators: pompeiisneaks, Colossal
Why 10k in-series with primary side of reverb driver tranny?
I've seen a 10K in-series between the hi-V primary of a reverb driver transformer and the B+ voltage. Why is this resistor sometimes present in a reverb circuit? What does it do? Tonal advantage?
Re: Why 10k in-series with primary side of reverb driver tranny?
Without seeing a schem....
It's dropping some voltage to the reverb circuit so the 12AX7's don't see too much voltage.
Ideally there should be a filter cap from the node after the resistor to ground.
It's dropping some voltage to the reverb circuit so the 12AX7's don't see too much voltage.
Ideally there should be a filter cap from the node after the resistor to ground.
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Re: Why 10k in-series with primary side of reverb driver tranny?
Just backs down the plate voltage on the reverb driver to not over dissipate the tube. Depends on the tube you use, the source voltage, and how the tube is biased.
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Re: Why 10k in-series with primary side of reverb driver tranny?
picture this:
12AT7 reverb driver with both plates connected to reverb driver tranny primary. The other side of the primary goes through a 10K resistor to the "B" supply (Fender blackface "B" is "output" of the choke (i.e., the low side of the choke, as used).
The old blackface and silverface schematics have the reverb primary connected straight to the "B" power supply. I.e., no 10K resistor.[/img]
12AT7 reverb driver with both plates connected to reverb driver tranny primary. The other side of the primary goes through a 10K resistor to the "B" supply (Fender blackface "B" is "output" of the choke (i.e., the low side of the choke, as used).
The old blackface and silverface schematics have the reverb primary connected straight to the "B" power supply. I.e., no 10K resistor.[/img]