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Do FIlter Cap Values Matter in a Marshall? IN DEPTH MEASUREMENTS and TONES!!



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Continuing to fine tune my own 1983 JCM800 2204 1987 50w. Today we are experimenting with power supply filtering via power tube screen supply node and filter cap. A/B test of a 50+50uF can cap for the screens and phase inverter up against a 16+16. A bit of theory and some investigations at the bench to objectively observe any difference. Lots of tones too with the 16+16uF cap in place.

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Signal path:
Guitar - Amp - Suhr RL - Ownhammer GNR IR's - Apollo Twin - Logic Pro

0:00 Play in - 16+16uF
1:07 Intro
3:45 50uF vs. 16uA A/B test
4:32 Feel - my thoughts
5:43 Schematic - filter nodes
10:45 B+ supply line
13:08 Filter caps as low pass filters - the math
16:04 More tones
16:43 At the bench - 50uF measurements
19:58 Time lapse cap change
20:18 At the bench - 16uF measurements
21:49 Comparing the 50 vs. 16uF scope trace
25:10 Play out
Category
Audio
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