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Based on conversations I've been having lately with Modman, I decided to pick up an upmarket load box to see what that's all about. I had experimented with the concept a bit way back when I worked for Weber and was making attenuators all day. Lots of people (at least in the TGP scene) think this Suhr one is the hot stuff (or was the hot stuff a few years ago :lol:), so I nabbed one. Inside isn't a surprise: resistors, caps and a couple inductors. Usual things for a reactive load. Anyone...
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...
This is a nice and rare rack mount tube preamp from the early 90's from Jackson. I have traced the power supply and created a schematic. Its just a simple linear supply.
I was thinking about reverse engineering the whole thing. Leave a comment if you want me to trace the entire thing. If I get enough interest Ill do it.
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.
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...
I've been looking for another submini amp build, I've breadboarded a few of my own ideas, but nothing satisfied. Today I breadboarded a submini version of Doug H 's Firefly using a 6112 and a 7327. I really like it. Very crunchy at maximum volume, and pretty clean with the volume rolled back. The 7327 tube I used is a rare beast indeed, it's a mil-spec replacement for 6111/6021 and capable of handling up to 300 volts on the plates. A 6021WA could be used as a suitable replacement, the WA suffix...
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...
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...
Would anybody be interested in some gut shots of an old Marshall lead 12 practice amp from 1984? Its my mates, the pots are a bit scratchy and I said I'd take a look at it. Ive got it for a week or two so let me know and i'll upload some pics.
Hi everyone!
Hope the topic is in the right area.
I'm updating the ugly jpg schematic of this amp, now I've made only a single channel version, removing the electronic switch. Here's an eagle version with really dummy libraries (sorry, first works with this software!), but more readable than the old one,and (I hope) useful!
I'd like to put this preamp in a box, and if someone wants to help with the layout will be great!
I found schematics in my archives with layouts and almost all with sound samples from the Bluetone amplifiers.
I searched for the files on the internet to link them, but could not find them anymore. Interesting stuff that should not be lost, so here are the files.
bluetone_plexi_lead_schematics.pdf
03_bluetone_plexi_lead_with_vvr.mp3
02_bluetone_plexi_lead.mp3
bluetone_melissa_schematics.pdf
No sound file
bluetone_liverpool_schematics.pdf
06_bluetone_liverpool.mp3...
Some screenshots:
Screen Shot 2019-12-10 at 10.57.51.png
Screen Shot 2019-12-10 at 10.58.38.png Screen Shot 2019-12-10 at 10.59.01.png
You can check out the house too:
hey gang,
so recently i picked up a blown up marshall 12 watt reverb combo. when i say blown up? i mean LITERALLY.
this model had a tankless reverb deal mounted right to the amp pcb,
and one of the 3 springs broke somehow.
when it did, it literally took out the amp inside.... the spring melted into about 16 parts!!!
never seen that much destruction in this way before..
most of the amp was destroyed, and much of it had been disassembled by the seller, who gave up on it.
i was like..... hmmm.......
This beloved amp is getting old or tired of my playing.
Plugging in into High Input and turning preamp pot from 8 to 10 behaves weirdly
loud squeal if cable is plugged in without an instrument;
with single coils middle pickup squeals and with bridge or neck pickup it has harsh sound when distorting;
with single coils turning down the tones remove the squeal;
With humbuckers there is no squeal at all;
Power tubes have been already replaced with matched EL34, bias 8uf caps replaced....
Well maybe not boutique but certainly customised beyond what a Peavey Bandit SS usually does!
I love Bandit's since they're indestructible and very loud for cleans (that's another post).
So I picked up a good cond Bandit 112 Red-Stripe on Gumtree and I've decided to re-design it as a new(-ish) amp.
The nice people at Peavey have supplied the schematics for my amp on request and I've set about scribbling over them with ideas.
Here's my plan:
Keep the existing power amp board pretty much as...
Since I have the Bandit 112 I Wanted to do something about the attenuation.
The amp starts breaking up (transtube) at Vol 6-7 at 25% of power level but still, too loud for home use.
I have the 2-silver stripes version:
I found on a post from 2020 a guy saying he added a master volume after the T dynamics circuit and said: it is a 47k / 50k pot in series with the feedback tail. At 50k and T dynamics at 10% one now has 0.65 crancked Watts
He also added this Schematic (red...
Amplifier is build on standard tube topology and suitable for home low audio lewel playing.
Measurements an 1W output power:
Amplitude-frequency response (presence min)
the influence of presence control with the different values of C13 (according to schematics)
THD at 1kHz
Transformer primary coil impedance Ra-a is 360 Ohm.
I used rewinded 15W power transformer for output one.
Only one requirement - the thickness of plates of transformer core must be not more than 0.35 mm.
The...
i want to do an flour version of engl rb100 preamp from engl blackmore amp. I have schematics of this. I want to do it on pcb because that will be an pedal not an normal preamp. But i don't have so big skills to do an pcb can someone help me do the pcb for this preamp please?
i add file with schematics of engl preamp only thing you must to change is:
R26 change to half
I'm looking to build a portable, pedalboard-mounted Class D poweramp project for myself and I was wondering if anyone had used a Class D module to do so.
The Seymour Duncan Powerstage 170 uses an ICEpower 50ASX2BTL module and I was wondering how easy it would be to create a pedal-sized amp to go with different preamp pedals and circuits that I've built (or are in the works). I wouldn't need the preamp that the SD uses, just the power.
I'm a paint-by numbers diy-er who has made dozens of pedal...
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