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 guys, I'm pretty much an electronics noob--but learning lots from all the stuff available. Now, I tried this mod (though a few might laugh to call it that)
I like the more natural boost sound, but everything else seems sharp and sterile.

I was wondering what you guys thought about this and the vox pathfinder 15 in general/mods

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...

Hey Everyone,
Been a while since I last contributed a new thread to the forum, anyway, thought I would start a thread about a Tube amplifier I built a few months ago, okay, so what is it? I hear you ask, it's an OTL (Output Transformerless) Tube amplifier I built using three Svetlana 6N1P medium mu twin triode tubes I bought online from Evatco, I built the amp so that I could connect my pair of Audio Technica ATH-M50X headphones to my 43 inch Blaupunkt smart TV, the TV does not have a built-in...

Hi,

The Vox AC30CC series has small pcb mounted toggle switches on the front panels.
These toggle switches have a cap on top that is apparently glued on with some kind of threadlocker (such as blue loctite?).

I need to remove the pcb for repair and would like to do so without damaging the front panel.

According to a youtube video of Psionic Audio (Lyle Caldwell) the threadlocker can be resolved by using acetone.
I have tried a few times getting acetone in using a q-tip, but no luck so far....

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...