Tube Amp Archive

Interesting discussion, as usual... Reminds me of some debates that take place in the recording community - the human range of hearing extends to about 20khz if you're lucky, yet there are digital recording interfaces that accurately record and reproduce music up to 48khz, even 96khz. Many people a...

curious, has anyone here modded one of the AC4TV's to sound better? mine is great clean, but cranked up it doesn't give up the goods like a good vox....have been considering a HW but it can't be that difficult of a circuit to mod a bit? I just did the Murcury Magnetics Studio Pro Upgrade. Not sure ...

The simple circuit mods I did on my brother's AC4TV made it a much better amp ... It's interesting that there is a lot of similarity to what I ended up with, from trying to do the bare minimum mods and what Mercury does ... except I modded the tone control to be a LiteIIb tone control. --==-- I'm s...

[IMG:212:79]http://i828.photobucket.com/albums/zz207/rzphotog/ScreenShot2014-01-24at24128PM_zpsd724e1a6.png[/img]

[IMG:596:76]http://i828.photobucket.com/albums/zz207/rzphotog/ScreenShot2014-01-24at44428PM_zps1947676a.png[/img]

... Wow! I guess just replacing the iron wasn't convincing enough for MM. :lol: The stock circuit is fine clean at low volumes but pushed into distortion it's horrible with the DC biased second preamp triode, fizzy, fuzzy horrid ... ... the Merc Mag "Upgrade" removes nearly all the original compone...

I did some modding on an AC4TV of my brother's ... I focused on getting rid of the fizzy tone ... - 10uf cap on v1a cathode (C16 - 1uf stock) - pull the v1b cathode bypass cap (C11 - that was the 10uf I used in v1a) - pull the 'tail' cathode cap on v1b (C12) - jumper C12 to remove the DC grid bias ...

Figured out what was going on with this thing. C-17, which is one of the original parts that stays was the incorrect value. Was supposed to be a 10u and happened to be a 220u so it was loading down the circuit. The amp sounded pretty nasty from day 1 and the tone control did very little, but I figur...

It's nice to see some really killer shaping out on those amps folks! For the folks concerned about service issues with laced bundles... Not to worry! Once you do your signal tracing, if you need to replace a length of wire, you can either snip the lacing you need to, or tie a length of pulling flos...

It's nice to see some really killer shaping out on those amps folks! For the folks concerned about service issues with laced bundles... Not to worry! Once you do your signal tracing, if you need to replace a length of wire, you can either snip the lacing you need to, or tie a length of pulling floss...