Blackface R17 values?

For you Bob Villa types that modify modules

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Dr.G
Donating Member
Posts: 53
Joined: Sun Dec 09, 2012 7:59 am
Location: Germany

Blackface R17 values?

Post by Dr.G » Mon Jun 01, 2020 12:12 pm

Hi,
not sure if this part of the forum is much frequented at all but I`ll try it anyway.
I have an old Blackface module where a 1.8k resistor is at position R17. In the Pearson Component Spreadsheet R17 is a 4.7k resistor. Does anybody know, what R17 is for an how it affects the tone of the module?
Thanks

Dr.G
Donating Member
Posts: 53
Joined: Sun Dec 09, 2012 7:59 am
Location: Germany

Re: Blackface R17 values?

Post by Dr.G » Wed Jul 29, 2020 11:25 am

Ok guys, I`ve found the answer. R17 (as well as R29) influence the bias point of the tubes and therefore affect the clean headroom of the module.

viewtopic.php?f=2&t=21317

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