resistor in place of choke

allsavy · 03-29-2009, 12:55 PM

I've got a 500 R/25w resistor in place where the choke would normally go in the B+line. My B+ voltage is only 357v before the resistor. Can I dispense with this resistor to utilize more voltage to the following stages (the resistor drops 62v) or is it needed to serve another purpose other than dropping voltage? Like a CRC filter perhaps? I do have a 470R @ pin 4 of each 6v6 and 1k @ pin 9 of each EL82 (mixed tube power stage).

allsavy · 03-29-2009, 03:50 PM

Correction... there is only an 8v drop across the 500ohm R.
I had my first B+ (to the OT center tap) connected to the wrong end of the first set of series caps. Silly me !
Voltages came up about 10v all around.
Still concerned about the low voltage tho. Perhaps the 2 extra (el84) tubes are too much load on the PT.

I have 288v at pin 4 of the 6v6s and same with the El82s.
Preamp tubes have between 170v and 240v.

The amp might sound cool like this ???

I am looking for early overdrive.... even a bit ratty sounding would be cool.

My other amp (a silvertone) has very low voltages on the preamp tubes and it sounds kind of gritty as it breaks up. I like it.

Would this be mostly due to low voltage?

03-29-2009, 12:55 PM	#1
allsavy Member Join Date: Dec 2008 Posts: 76	resistor in place of choke I've got a 500 R/25w resistor in place where the choke would normally go in the B+line. My B+ voltage is only 357v before the resistor. Can I dispense with this resistor to utilize more voltage to the following stages (the resistor drops 62v) or is it needed to serve another purpose other than dropping voltage? Like a CRC filter perhaps? I do have a 470R @ pin 4 of each 6v6 and 1k @ pin 9 of each EL82 (mixed tube power stage).

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03-29-2009, 03:50 PM	#2
allsavy Member Join Date: Dec 2008 Posts: 76	Correction... there is only an 8v drop across the 500ohm R. I had my first B+ (to the OT center tap) connected to the wrong end of the first set of series caps. Silly me ! Voltages came up about 10v all around. Still concerned about the low voltage tho. Perhaps the 2 extra (el84) tubes are too much load on the PT. I have 288v at pin 4 of the 6v6s and same with the El82s. Preamp tubes have between 170v and 240v. The amp might sound cool like this ??? I am looking for early overdrive.... even a bit ratty sounding would be cool. My other amp (a silvertone) has very low voltages on the preamp tubes and it sounds kind of gritty as it breaks up. I like it. Would this be mostly due to low voltage?

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