How to add an additional pre-amp stage to 5A3 design - Page 2 - diyAudio
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Old 23rd February 2013, 06:10 AM   #11
ivan H is offline ivan H  Australia
diyAudio Member
Join Date: Jun 2012
Hi gkenne, so I had a look at a 5C3 schematic I had at home. I imagine its pretty similar. Anyway it uses a 5Y3 rectifier & 2 6V6's with a 6SC7 phase inverter, plus another 6SC7 used for 2 pre amp channels. I would Get 3 new 6SC7GT's & use 1 as the phase inverter as well, & set up ur power amp as it is in the 5C3, NFB loop & all. Is a proven design that'll sound great. U mentioned the Bassman's pre amp, which became the classic Marshall (5F6A bassman). On SMD's site there is a layout & a few instructions that show u how to put together switchable 1959 & 2203 two in one pre amp section, (google 1959 or 2203 2 in 1) which is either 2 or (switchable) 3 gain stages + cathode follower driving the tone stack. Then u can still tweak the first 2 or 3 gain stages in regard to voicing or the amount of gain each stage delivers. Add a switchable 3 in 1 tone stack & u'd have a versatile & great sounding amp that u built for bugger all. Hope this helps. Cheers
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