STOLEN From Marshall® : Add an “EXTRA Channel” To Your TUBE Amp

[@WaylonMcPhersonGuitar]

I ❤ this MOD, you guys got any interesting ones? ** Challenge: There is a typo in this video, can you find it! 😜

[@hamishlaing1542]

My one and only mod is to my DSL20. I rerouted the output of the Green channel from RL2 to utilise an extra gain stage. It now uses V1A, and then to V2A, then V2B.. It used to go straight to V2B. Much more gainy 😊

[@romanhausner456]

It says pin 7 to pin pin 2 instead of 6 to 7. probably not the greatest idea:) great mod though, will definitely try it on one of my builds. And I haven’t seen this one before on robrob. Thanks!

[@hearpalhere]

Love your videos Waylon! The mod is cool, definitely gave a bit of special sauce to the basic sound. I also want to say that your rendition of Amazing Grace was really great! My wife and I make guitar picks by hand from coconut shell and would be really happy to send you some. Let me know if you are interested.

[@MC-ee1ey]

Another simple mod is to have switchable values of cathode bypass capacitor on V1A which alters the gain of this stage a bit. Takes some experimentation to find values that you and the amp like. I have also done this on the power stage of a single ended amp (one output valve/tube) BUT be careful that you don’t end up with an oscillating output stage. Long time ago, but I think I found these in the book Inside Tube Amps by Dan Torres.

[@GeorgeSharp-rv6ez]

This mod sounds fantastic (through my stereo). I would think that this mod could even help an inexpensive amp. Your explanation(?) and illustration made this very easy to understand, especially for those of us who have '"no" experience. Thank you!

[@hamishlaing1542]

Super cool! I was just looking through the schematic of my JCM600, and see instantly what you're talking about. Food for thought for another day .... sounds like the perfect way to get a nicer sound on that diode clipped channel. BTW, I really enjoy seeing you noodle 😃

[@aquilarossa5191]

Questions: 1. Where did you get the components in NZ? Import via Digikey or whatever? Always puts me off, because of shipping costs costing more than the parts themselves. I did import a bunch of caps and stuff, but no diodes. 2. Where would you put it in a JMP 1987 clone? I figure in the case of my amp you are saying it would tap off the anode of V2b and feed back into the grid, so the clipped sound then goes back out the anode and on to the V2b cathode follower? Yeah, or yeah, nah? 😆 BTW. I have not 2204'd it, so the second gain stage is not on V1 like with the JC20H. I really like its Angus tone wired as a JMP 1987 and with a 0.0022uF coupling cap between V1 and V2, but sometimes I need a little more drive and squish etc. The Mr Scary V2 mod is the easiest way to add more drive :P (it's not cheap to import though). P.S. I think it might be possible to use 3-way switching so this mod does this method of clipping, but also so it grounds like a regular Jose mod. More faffing around, but the regular Jose clipping like that Headfirst Jason fella does over in Aussie does sound really good, especially when he adds his tweaks (he's a Kiwi BTW).

[@giulioluzzardi7632]

Seems to make the tone "Fatter" and more touch-sensitive. Can we do this on a Fender Deluxe style amp? Cool.

[@sytharnia1717]

Damn I wish I still had my JCA 20 ... this mod would have made me keep the amp

[@gstube1]

So this creates more asymmetric distortion?

[@flecht]

Now I wonder how my slightly modded AC30cc2x (TB channel) would sound with this mod.

[@MadScientistGuitarLab]

Does this mod necessarily have to go on a cathode follower?

[@soapboxearth2]

I'm trying to think if this would work on a single ended amp with one preamp tube?

[@WaylonMcPhersonGuitar]

It would but you would most likely loose too much volume!

[@soapboxearth2]

​@WaylonMcPhersonGuitar oh ok. I see. I may try it on one of my 5f6a based amps then, thanks. Interesting mod. I've never looked at the jubilee schematic before. I've been curious about the Jose diode mods but I may just give this a go first. Cheers

[@kevinshumaker3664]

Super cool! Any idea what would happen installed in an Ampeg SVT 3 Pro bass amp? Love your videos, cheers! 🤘

[@WaylonMcPhersonGuitar]

oooo! That's a interesting idea! That could sound really cool!

[@charlesdeal771]

So, you bridged pins 2 and 7 with the diodes? I would expect it to be between pins 6 and 7.

[@WaylonMcPhersonGuitar]

Correct, 2 & 6 are connected on this particular amp, cheers!

[@martydibergi5228]

anyone know Any Pro amp repair in Toronto Canada? thanks this video is Excellent! i still own my original 1964 deluxe reverb. yes, old now❤