Is very much like the little pink amp a restored a few years back. That one was sold off, I just had too many amps around the house, and too little time to play them all. Little Pinkie was very wanted, just because of the color. But it also meant that I had to spend about 275 euro to wrestle it from the hands of some Flemish hipster soccer milf. It needed new tubes, a whole bunch of rewiring, filter caps and a new speaker. Then the guy who bought it haggle down to 350 euro, though I wanted 375....

Hi,

anyone has schematic of this little amp? I own it and am just curious to see what they did.
It's all SMD, so it's a bit of a pain to reverse engineer. Would maybe consider modding the tone stack if it's possible to do without too much SMD work, but it's unlikely.

Tnx,
Bancika

Hi all.
I came across this forum looking for a volume fix for a DOD FX50B and I found it, which was really great after not using that pedal for that particular issue.

So... I began playing the thing through some amps and finally got to my little Fender Frontman 15 which we all know are not quality amps.
That being said, I won't sell it and got to think about modding it up:

1.- Adding a reverb tank. It has the circuit printed, so... could I just solder the missinf components and build a tank...

Not sure if there already is a thread about one of these, but anyway, I thought I would start a thread about my Boss Katana KTN-100 Mk II digital modelling guitar amp, I bought this last year if my memory serves me right, I decided to buy one because a, it's lighter than my Marshall amp so I no longer hurt my back hauling it up and down the stairs near my flat, 2, it has 8 user presettable channels, 3, each of the 8 channels can have up to 5 virtual pedals chained in a row.

The amp also has an...

Since I could not find the documents on the Internet, I post them from my archive packed in ZIP files.
There are schematics, layouts and pictures to find.
Seymour Duncan Convertible Schematics.zip
Seymour Duncan Convertible Layouts.zip
Seymour Duncan Convertible Shots.zip
Seymour Duncan Convertible Instructions.zip

I'm already searching doggedly, but I can't find a circuit diagram for this device. Maybe someone has such a circuit?

Does anyone know where I might be able to find a schematic for the Marshall JMP-1 preamp's footswitch? My friend wanted me to build one for him since they are sort of hard to find/super expensive. He thinks it uses a midi cable. Not sure its something I want to tangle with but was hoping to take a look and make sure...

--Brad

Hi there, I search a bogner fish schematics :)

Thanks

Hello
my Quad Preamp has suffered from being stored during near a decade... yes it's a shame :roll:
So of course I will have to change the electrolytics, all the orange drop capacitors which are on the anodes, and of course... the vactrols ...
Some of them have died at power-on, when I tried to use the preamp after its long sleep in the closet.

Of course, I plan to roll my own 19 vactrols, seeing that the most important specs to target seems to be the R off which should be greater that 50Mohm...

Hi Everyone,

I've just recently been given a Peavey Backstage Plus 35W Solid State guitar amp for nothing, and I'm currently working on it to get it back to a useable state, so, what's wrong with it?

Well, the original speaker is a no-worker but the rest of the amp seems to work fine, I verified this by plugging my pair of headphones into the headphone socket, I get normal sound through my headphones but no sound through the speaker.... :thumbsup

I've managed to find what I think should...

Roland PA-250, powered mixer and the art of internal wiring from the early 80's

there are no photos of this mixer on the web, so I thought maybe it's not a bad idea to post some ...

operation manual - pa250.pdf ROLAND_PA-200_PA-400_SERVICE_NOTES.pdf service manual - pa-80_150_250.pdf

I figured I may as well post this here for anyone who may want to clone this thing... I ain't never gonna have time to do it so, if this is on your bucket list or you're just bored, sitting around waiting for nuclear annihilation or another bio-weapon attack... then this may keep you busy while you anxiously await the destiny of mankind...

Here is another mod i came up with. I haven't done the mod yet but will start on a layout today and wire it up soon after.
For this one you have to lose the effects loop (I dont use it) but you gain the ability to jumper the inputs for some marshall (well fender actually) magic. Here is the schemo.
Enjoy Johno
VHT S6U 1959 pre amp mod.png

I've saw this micro amp with KIA6213 and TA7313. This is a version with NJM386 IC amp.
Q1: 2SC3198 hFE=244
IC1: JRC NJM386BL SIL8
I've used LM386N-1 instead.

HH Micro 30 front.jpg

I thought I'd get my ass kicked repairing a little solid state amp which has very low volume. Good news is there were already a few people with the exact same problem:

But neither threads comes provides a solution. Symptoms are: big pops when plugging in and out, clearly not loud enough and a lot of background is. I know somebody has worked on the amp, because the legs of the first BF245C are sticking, not clipped off. Somebody has been messing with the input...

I want to use two 12 volt filament transformers back to back followed by a voltage doubler to power a marshall style tube preamp. The voltage doubler is a full wave bridge rectifier with two of the diodes replaced with two capacitors. (You all probably allready know this.) My question is how large and what voltage should the capacators be? I haven't found many schematics on this but the ones I've found range from 10uf to 330uf. I'm using two 12ax7s. The voltage doubler is converting 120 volts...

IMG_7647.jpg
Screen Shot 2022-03-17 at 09.38.37.png

NAMM 2006 interview with Mike on buying the Russian factory in 1998 and the attempt by another company to take over the building. He then calls in the Putin administration and they take care of business... - hence production went smoothly for 15 years... Then we had the Russian counter sanctions, but now Mike called Vlad and got it sorted out?

It is incredible to hear him reiterate the same anti-fascist bullshit as we hear from Putin....

So I recently got a Roland CH-60 for a song on ebay.

Roland Cubes are a part of my past, I used to load my Dad's Orange Cube 40 into the back of our Brown Austin Allegro on gig nights. It was the first amp I used and I'm mostly a jazzer so it's clean and I like that :)

The CH-60 also packs the Boss CE-2 chorus or very near to it, which was my Dad's favourite pedal (back when he used them). It is concerning that that I'm posting tonight.
They've hard wired a very slow deep chorus on it 3k3...

I'd really like to see a schematic and maybe the build instructions for the London power scaling kits, esp. the SV2 and the VCK voltage clamp kit.

This thread has a lot of close-up pictures, parts of the schematic and build instructions: