Hi guys, I'm repairing this amp but actually I cannot find a solution.

Clean channel and Power Amp works correctly.
Boost channel works but has a really low volume.

In attachments you will find the schematics.

I checked the tube section and everything is fine. Autotransformer works.

Voltages at tubes are:

1 - 181V
2 - 110V
3 - 110V
4 - 5,8V
5 - 5,7V
6 - 110V
7 - 0
8 - 0,675V
9 - 0

D3 Cathode - 266V

IC3 and IC5 are working because the switch is works correctly. I don't have replacement at...

hi friends,

last weekend was a raining, non-skydiving weekend, so i had time to analyse this amp... ;)

comments are welcome!

regards, kusi

Here are the real Fender amp schematics for EVH5150 amps and footswitch in case there any use to anyone.
They can be found on the evh/fender website, but for easy download and reference I put them here.
100w and 50w versions.

Small convenient practice tool that clips onto a belt. Plug an instrument or pedal board into one end and headphones into the other end. Powered by a 9v battery fit into a 1590A size enclosure.

GBisson_EHX_HeadphoneAmp_Schem_2024.10.25.png

EHX_HeadphoneAmp_top.jpg

EHX_HeadphoneAmp_bot.jpg

Hey there! I bought this Peavey Express 112 to leave it at my music school as a students amplifier, it cost me 35eu, so nice deal there, the clean seems to sound mostly good. I cleaned all the pots and reverb connectors and now reverb sounds good, also the seller told me the amplifier wouldn't switch to drive channel, and yes it doesn't, with the tester the switch seems fine. I found that there is a resistor burnt, R101 is completely fried, so i removed it but I don't have a replacement yet,...

So I am currently listing my Orange Rockerverb 100 MKII + ppc212 for 1650€ and I have been recently offered a trade with an Hiwatt dr103 reissue from 2009 + fane 4x12 cab. I would have to add 700€ on top

What you think about it? Would you go for it or pass? I am bit puzzled

The rockerverb clean channel to me is meh, right now I am not using the dirt channel at all and I am bypassing the preamp by plugging a fender valve preamp in the return

Hello,

Can anybody help me out
What is this brown thing covering the resistors? Could it be on purpose when assembling the amp or are the resistors starting to fail?
I've mesured them from the bottom of the board and they are ok, on the top of the board i don't get any readings.

I'm looking at these because my bogner alchemist is changing channels on it's own.
I've looked at a schematic and noticed that these resistors are in the path that gives 3.3v, witch is the voltage for the...

Hello all, This is my first post!

I've been trying to sign up to the ampgarage forum, but my account hasn't been verified. I've emailed a good few times, but to no avail.

Please can someone prompt or maybe nudge the forum admins, as I've got a few things to post, and in need of help.

Thanks,
J4mes

Hello all,

Anyone know where I could found some of them?
Looking for that gain structure, but couldn't found any schematic to see where it come's from.

Thanks im advance!

Hey, peeps.

I've been itching to design and make a new circuit board. This one is the combined take on the infamous ruby amp with switchable bassman / hiwatt controls. There's also a headphone out, but the wiring isn't depicted as it's all off-board.

Regards,
J

Hi all,

I'm not really into buying more stuff, but couldn't let this one go. It's the 1960-4 Carad R53PA, a tube tape recorder using EF86, ECC81 (x2), EL84 and an EM84 indicator tube. It has built in speakers but simple standard jacks for input and external speakers. I haven't hacked into it yet, the video below is a quick tour around the thing. Would look great just sitting on a speaker cabinet, with the red pilot light and the green indicator blinking away...

Second ECC81 is not used in...

I am working on a 12ax7 preamp with the possibility to be connected directly to a cab, speaker out.

I am following the same principle of orange terror stamp but my output is barely audible

- hiwatt dr103 late 70s normal only
- Vs 9v
- phase splitter not yet implemented
- STA540 stdby pin 7 5V

What could the cause of a weak signal and distorted?

Hey Everyone,

I'm currently in the process of working on a diy Sloclone 50 Tube amp build, it is basically a 50W Soldano SLO, but, I'm planning on using a pair of matched JJ KT77 power tubes instead of 5881 tubes as used in the original SLO 100, I've never tried KT77 tubes before, apparently from what I've read online, they are like a cross between the EL34 and the 6L6, and are supposed to be a drop-in replacement for the EL34, a mate of mine said that KT77 tubes should be a nice choice for...

Old but gold!! I keep seeing a these everywhere! I also have a small batch arriving at some point this week! Searched this forum for circuits but not a lot comes up.

I built the tube version of the ODS (which I probably should share at some point if anyone's interested)?!!
It sounds great with most power amps, but I want to build a dedicated power amp (SS) and build a cab etc for home use.

Does anyone have or know of a circuit that would sound good for home use?

TIA,
K

Hi everyone.

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...