Search results

here are a few pics, let me know if you need a close-up on something. Thanks again for the help guys! The chassis was bent around the speaker jacks when I bought it, looks like a previous owner tried unsuccessfully to lean it back against a wall.

that would be great if all it takes is some contact cleaner and maybe replace some tubes. The venue I regularly play had really really bad electrical noise back when I was using this amp (which they have since fixed), maybe it's possible there was more tube wear than I realized.

I have a Robertson driver set now with hopefully the right size for this. Time to take some pics! Thanks guys!

I haven't played it in a while, so I'll need to get it back out and make a list of issues. IIRC, there was an overall lack of volume that seemed to have become more significant over time. When I would try to compensate by turning up volume and master volume it wouldn't get overdriven like I...

I bought a Ceriatone Lightning used about 15 years ago. It started having problems a few years ago and I switched to a Blues Jr. I'm not sure what's wrong with the Lightning, there could be a number of things and I don't think I could sell it in its current condition. I've never worked on amps...

Finally finished up these MKIs I've had on the bench for several months. I love them!! These are generic PNP sets I got recently from Small Bear. I started out with them in the MKI circuit on a breadboard (first time breadboarding for me). I created on layout on perf (another first for me) and...

It's a Madbean Road Rage 2019 version (y)

I'm planning to do a proper build report, but thought I would put these here to kind of bookend this thread. The silver MKI is built to standard specs and the gold is Castledine specs. There was MKI pain but they sound great. 😅

I made a new layout that puts all the pads except the -9v on the bottom row and turned the transistor orientations to allow more space if you have long leads you want to bend. Verified!!

I think I have some Micro Sol somewhere, I'll see if I can find it and give it a shot. Thanks! (y)

I've been using Papilio Inkjet waterslide decal paper for years but decided to try the Sunnyscopa paper because it's easier to find and slightly cheaper. I did the same process I had been doing for the Papilio paper. When I apply the decal there's often a little area around the drill holes where...

If I was doing this again I would flip the 10n so the Input pad could go down by the Ground pad. Also, my sockets are straight in line so the trace routing through Q1 was kind of a problem. I could have maybe compacted it a bit more but I used a large axial 25u cap that took up a 9x4 space, but...

Verified, baby!! 😃 I noticed that the vero layout I had used before was doing the offboard ground connections differently, so maybe that was the issue. Anyway, works great, no noise other than the regular MKI stuff! 😅

First layout EVAR! 😅😅😅 unverified!

Yes! That's the blog I've been looking at, it's been incredibly helpful to have the schematic and component table. I've been going with his Castledine values for the most part, and subbed in a 500k trim pot for R3. Also a 1.8M for R9 to get a little more output volume. My breadboard setup sounds...

I forgot to mention: after fiddling with the vero build a bit I took it back to the breadboard. Fortunately the transistors are fine and it sounds like it did on the previous breadboard arrangement. So I'll probably try making a perf layout. Hopefully sticking to the schematic and breadboard...

I got my MKI set up on the breadboard (first breadboard project BTW) and it sounds quite good. So I took my components from the breadboard and soldered them in to a vero board based on an existing layout, but it just doesn't sound the same. It still sounds good overall but there's a bunch of...

My range on the Attack knob is not very wide, maybe I should try a linear pot. I tried out a 25u cap after Q2 like the Gary Hurst version but preferred a 100n. My old MKI build is a Gary Hurst version with 2 25u's, I might swap out that 2nd cap on that one too. Andy's blog has a lot of good...

I messed around with a few part substitutions but honestly it sounds pretty decent with stock values. I went with 470k on R3, 33k on R10, and 1.8M on R9 of Andy's schematic https://vero-p2p.blogspot.com/2022/12/tone-bender-mki-component-values-table.html

if I'm reading the labels correctly Q1 is an OC75 with hFE 75 & 250(?) leakage, Q2 is a CV7003 with hFE 131 & 40 leakage, Q3 is an OC42 with hFE 100 & 15 leakage.