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The circuit started out as an exact copy of the SLO circuit and I have been tweaking it little by little to get it where it works for the way I play and what I am going for. I love all types of amp tones and really dig everything from early classic rock to the most brutal modern metal tones I...

LOL I found humor in the use of a healthy relationship book to hammer turrets! I feel like my relationship with guitar gear and amp modding/building isn't very healthy. The board looks cool btw. I hope to do a turret board build one day.

I'm actually interested in this and PCB layout. I have DIYLC but is there an equivalent for pcb layout. I'm not even close to ready but I want to practice and maybe start with a couple small items. Is there a program that will suggest component layouts based on schematic or is it a more manual...

Is there a reason the polystyrene are suggested as opposed to other composition? I know certain circuits can benefit from certain types of component materials but were those suggested specifically for a reason?

I agree! It’s great to have resources available from people that know their stuff, I know the internet has plenty of negatives but I wouldn’t have gotten anywhere without a lot of the technical info like we have now. Somehow I missed out on forums until about 10 years ago.

I’m looking to add a global tightness control circuit to my amp. My initial idea was a 3 way tightness switch to change the coupling cap value after the first gain stage and instead I was thinking of implementing a low cut pot after the first stage coupling cap. I figure a .047 for the coupling...

Currently still tweaking my Jet City 50H with custom preamp voicing mods. Started as an SLO spec mod and have tweaked values to be more modern, easier to play, and tighter. The stock screen filtering is 50uF and the PI filtering is at 68uF. I’m wondering if lowering or raising the values might...

Yeah the stock loop recovery stage on the 50/100 JCA amps is the first half of V4 before the mod and the mod I got for it, which was something I bought early on in my amp modding journey uses the first half of V3 as the recovery stage which has a 1uF already. The mod moves V4 and the tone stack...

Thanks for the info and photos! I’ve actually done the mod before a few times. I also did it on my 100hdm and again now on my 50H which I modded to slo spec. Reason I posted the question is because the 4th gain stage is swapped from V3 to V4 and there should be a bypass cap on the 4th gain...

Awesome thanks for the info.

Awesome! My question is how did it work for you and also did you just swap the stack and loop or did you alter v3/v4 to accommodate the changes?

I don’t have a completed schematic for it. I will see if I can make one in the next couple of days.

I have a mod to move the SLO/Jet City effects loop after the tone stack. In this mod V4 and the Tone stack take the place of V3 making the first half of V4 the 4th gain stage. Since the 1st half V3 was a 1.8K cathode with a 1uF bypass cap & V4 has 2.2k cathode without a bypass cap should I...

Well the noise issue is gone! We were having power issues in the neighborhood and after talking to my neighbor apparently we had low voltage which I somehow missed on my power conditioner input meter. Today the voltage came back up to 117 and the noise is gone. Not sure how or why that would...

I’ve seen tube sockets look rough like that and assumed it was from people rotating the tube until it found the key way and dropped in. I’ve had amps and replacement tube sockets look like that but they were cheaper and poorly manufactured but I wouldn’t expect that to be the case with a Mesa or...

The sheet metal doesn’t seem to affect it. I did however notice the power transformer I just installed seems to have very slight physical humming when it’s on and kind of matches the frequency of the noise in the signal. The other noticeable thing is that from the factory the PT and OT are...

I run my amps through a voltage regulated furman power conditioner. And actually that shielding with metal sounds like a great possibility and I wouldn’t have ever thought of that so thank you! I’ll give that a shot tomorrow and I’ll let you know what happens.

Actually I wasn’t completely correct the gain control for V2 slightly increases the noise if you go high enough. I just wasn’t turning it up enough. Also I must have missed something but getting close to the grid on the input stage of V1 also adds a slight bit of noise but nothing close to the...

Actually I wasn’t completely correct the gain control for V2 slightly increases the noise if you go high enough. I just wasn’t turning it up enough. Also I must have missed something but getting close to the grid on the input stage of V1 also adds a slight bit of noise but nothing close to the...