The Amp Garage

Hey All, We have both an SVT Classic and V-4B heads and love them both. They can both sound nearly identical, at low to medium volumes, when using the same mid center frequency settings. The down side here is that we prefer 450hz mid center of the #2 position of the SVT Classic, over either the 220h...

Matthews Guitars wrote: ↑Mon Feb 07, 2022 4:25 am The status of the amp as of this evening: Excuse the mess, I get it running first, tidy it up later.


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You do make the rounds of all the cool guy hangouts, dontcha!

Nice To Se Ya,
Gene

gktamps wrote: ↑Sun Feb 06, 2022 6:18 pm Huh. 10k - is this running a pair of 6AQ5s, or 6BQ5/EL84s?

Being a VOX, I might suspect the latter!
Just Sayin'
Gene

To get some preamp overdrive with the master volume, move it to between the 12AX7 common cathode gain stage and the cathodyne. An extra coupling cap, eg 0.022uF, will be necessary. I’m pleased it’s working out nicely for you, especially with the 0V common wire and its a single connection to the cha...

Well the choke may well be responsible for the silence of the amp, too. Keep Tweedin' Gene... 8) As for the choke, I'm not sure or not if it is responsible for the nice, springy, bouncy feel and response, but the touch sensitivity is pretty amazing. Even guitars with standard wiring (no treble blee...

That's interesting and the outcome looks pretty clean for what's something of a prototype... 8) Some comments about the addition of a choke: how worthy this is, meaning did you make some before/after comparison? Thanks for the compliment! I was going to do a with/without comparison, but it sounds s...

And yeah, I know the face and rear plates don't match the circuit! P-Touch labels have been grudgingly applied for now!
Gene

Well folks, I finally built this amp and it is indeed fabulous in many ways! A lot of what I surmised has come to fruition, although the surprise is that there is not a lick of audible distortion in the preamp section. The power section however, gives glorious overdrive/distortion, with nice clear d...

Phil D. You put that quite eloquently! I am in much the same boat, along with many others that want "THAT BIG BOY" sound, response and feel at "Little Boy" volume levels! It can be quite the balancing act, especially given that most commercially available amps "pare down" the features as they decrea...

Hey, thanks for all your great feedback and replies. It sounds like the attenuator over at the Marshall forum is a well working piece of gear to build. I would even consider using EL34's if its that good. (I did include pre and post master volumes on the plexi and like the options). You'd be surpri...

My sincerest thanks to all for humoring me on this trip down a somewhat less traveled rabbit hole. Please understand that, as I've mentioned here before, I am by no means a true technician or amp designer. I do however understand safety protocols and have the skills to be a good amp "assembler," onc...

What would we think of a generally stock JTM45, with KT66s and the twist of cathode bias? And what what need to be done/added to also support the use of 6V6s. Both tube models seem fairly happy with similar B+ voltages and both seem to be well suited for an 8K primary output transformer. Just Thinki...

Hi there. Has anyone had good luck building and using a low watt Marshall JCM800 for small clubs? I build a Marshall Plexi with 6V6 output tubes BUT, while having great tone, the amp can still get pretty loud. So, I imagine that although having more gain/distortion in the preamp than a Plexi, a JCM...

Ya know, Looking at the schematics for these Pigs and Piglet, it strikes me that the two channels of the preamp look an awful lot like a crossover! Is there anyone here who knows how to determine the crossover frequency and the dbs per octave slope, as well as whether or not there is any overlap bet...

Hey folks. It dawned on me that I've never thanked all you great folks for your spirited and informative contributions to this quest for knowledge of these amps. Unless and/or until I tackle building one of these, most of my my questions have been well answered. This thread was truly inspirational f...