![]() ![]() Well, not so hard, like AC-15īack to channel levels, I did some measuring yesterday and this is what I got at the output switch ( RLY2, or prior to Master volume) Also tames highs in clean channel a bit, although I like clean channel better without NFB ( It has that 3D sound hard to describe. NFB really tames and tightens overdrive channel. I tried both Top cut and Cross line Master control ( ala Vox, Matchless), but settled for NFB as in original schematics (only 6k8 from 16 Ohm tap), because Clean volume pot becomes Dirty gain 1 pot when switched, which I try to remedy with that switched second pot in the ground leg of the Clean volume pot. It is up and running, does not sound bad at all, clean channel is very bright though ( Ice picking bright ) and dirty channel is really good and goes from crunchy to lush singing distortion over the top Only downside is channel interaction, i.e. 3x 12AX7 tubes ( 2 preamp, 1 LTPI ) and 2x EL84 Everything else built from scratch actually, as in second schematics I posted. The thing I have not mentioned is that this is conversion of an old tube console of which I am using only the cool antique box, chassis and output transformer. And other parts, as well, if there is something that should be made differently. Would really appreciate some input regarding this part of circuit. But I need some kind of channel level adjusting in case I ditch it. I am not sure whether I should keep this PrePI Master at all ( when in Dirty mode I have two volume controls essentially in parallel). I decided to wire channel outputs via relay to keep them separated ( and to address volume difference later), and put temporarily pre PI master volume to control levels for time being. The original circuit has channel output mixing via resistors, voltage dividers actually, which formed 150k/470k when clean, and 470k/150k when dirty channel engaged. The part I am not so sure about is effects loop tube (which I don`t need), or if I simply erase it and connect preamp outputs with PI would it be ok? Regarding signal voltages and all. Only now there are not 2 completely parallel channels but rather cascaded/combined gain stages. Two channels in preamp section were pretty similar, so I ditched 1st tube in Dirty channel and rearranged switching to get two channels similar to original. Power amp I copied from Orange Dark Terror amp (similar to many other Orange 2圎L84 amps). ( Conversion of an old build, hence the restrictions). Authorised and regulated by the Financial Conduct Authority.This build was an attempt to build something similar to 2 channel TH30 amp, but with two EL84 output tubes instead of four and two 12AX7 less in the preamp. Registered office: One Arleston Way, Solihull, B90 4LH. Credit provided subject to age and status The Guitar Amp and Keyboard Centre Limited FCA registration number is 684977. ![]() GAK.CO.UK LTD FCA registration number is 731400. ![]() GAK.CO.UK LTD is an appointed representative of The Guitar Amp and Keyboard Centre Limited which is authorised and regulated by the Financial Conduct Authority. Registered office: 30 - 34 North Street Hailsham East Sussex BN27 1DW GAK.CO.UK LTDĪcts as a credit broker and only offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance. GAK.CO.UK LTD is registered in England and Wales 04578270. To apply for finance, add the product to your basket, proceed to checkout and select 'Apply for Finance' as your payment option where you can complete the application form online. Only available to UK residents, subject to age, status and affordability. ![]()
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