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I have no knowledge of this guy or his $9k builds with the "musical caps"....but...... In reference to the screenshot you posted, there actually is some merit to what he is saying.... Steel and aluminum have vastly different electrical properties, and most steel chassis have a zinc plating on...

The main issue with the PT supporting an output tube change is the heater current draw of the new tube type. EL34's draw 1.5amps per tube. KT88 / 6550 draw 1.6amps per tube. So an increase of 400ma across a quad. About the same as adding another 12ax7 preamp tube to the amp, which guys have...

Well...if you have the 1987x reissue, its actually pretty simple, given that the circuit in the reissue is a bit of a mash up of lead spec values. Both V1 coupling caps in the reissue are .022uf, and both V1 cathode resistors are 820ohm, so all you would need to do is replace the large...

Stock screen grid resistors are 100 ohms. When replacing large screen drop resistor with choke, change screen grids to 470 ohms, as choke will drop way less voltage than stock 400 ohm dropping resistor. You will have to pull the tube board to swap screen grid resistors. Older amps have tube...

I'm thinking it could be a triode stage configured as a cathode follower inserted between the tone stack and p.i. input, to drive the p.i. with a low impedance signal.....or maybe not.....:scared: Also, I believe the EVH Iconic has a solid state phase inverter.

Ok, so there you go..... :thumbsup:

Looks good to me overall. Changed tone pot is the only "mod" I can see. No big deal. I don't see any 1k screen grid resistors on the power tube sockets, so I would think about adding those. Also, for the other Marshall guys: is that ceramic cap on the mid pot something Marshall put in the...

Had an 83 Canadian 2203, that to this day, was probably the best sounding 800 I've heard. Had an 81 Canadian 2204 that was not great. Both amps were stock and in proper working condition. So typical Marshall.....it depends..... 2 BIG issues for me with the Canadian amps: the fuses on the extra...

Amp sounds decent in the video. If it will only go to 23ma with EL34's, then it will likely bias 6550's properly. I'd try that first, and see what you think with the amp properly biased. Those boards are a bitch to work on, and the traces are really fragile. If you are thinking about swapping...

Yes! the fixed depth ( cap and resistor ) must be in series with the NFB resistor. Remove the purple wire from the impedance selector, hang the resistor / cap combo off the 4 ohm tab, and connect the purple wire to the other side of the resistor / cap.

(y)

OK. It would be easy enough to adjust to taste, or just not use it / remove it. Shouldn't be a factor in your decision to purchase or not, other than the 2 holes drilled in the panel.

Yeah, that looks like a depth mod to me as well. That seems like an odd value cap to use though ( .02uf ) I would expect to hear only a very low frequency sub-bass boost with that value. A .0047uf cap is usually used for a depth circuit. How does it sound?

Thanks for doing this :rock: They all sound great, but after adjusting for equal playback volume of each clip in my listening room, I like the Monomyth best. At first playback, the Hermy and the Cam sounded best because they are louder.

Mmmmmmmmm .......junk steel......... Marshall probably contracted out the Origin trafo's to the lowest bidder in some obscure Asian locale to try and keep the cost as low as possible. However............ Ho - Lee - Fuk........do them damn transformers sound good. :inlove: Total sleeper mod...

Congrats on the new setup! Looks really cool. I feel your pain re: moving. We moved last July. What a shit-show.... Still gonna be another month probably, until my music room is done. Also, glad to see I'm not the only guy with a Captor X, a Suhr RL, and a cab M LOL! They all have their...

Yup, I'm thinkin' the Sylvania's are the gold here, with the RCA's sounding really good in anything "Fender-ish". Never been wowed by most other American NOS 12ax7's in guitar amps. Tough as nails, but not that tonefull for anything with gain. I like the Sylvania's because they seem to have...

The black bands can either face each other, or be on opposite ends. It will work either way. Technically, it shouldn't matter which way you do it, but i hear a slight difference in tone each way. Can't say one direction is better than the other, just different. Put 2 configurations on an...

Or.... if you're handy with a soldering iron, you could pick up an Origin 20 or 50 for cheap and do these mods... This is from forum member Burger, or Headfirst Amplification: I scored an Origin 50 at the local big box for C$400 ( approx $315 USD) and followed the vid, and the docs Jason has...

Holy shit :shocked: Not too well versed in the Ozzy / Randy / Jake / Zak history, but that clip is f'n amazing...... Much respect to Mr J.E.L :rawk: ps.: One of my fav things about this place is that you guys post clips that I would never have seen otherwise.... Carry on :rock: