The Amp Garage

I appreciate the sentiment of wanting to build something like this. I have a Fryette Power Station, it's a very good device, but overkill for what I want - a good non-tone-sucking attenuator, an opportunity to add post-power-tube-distortion effects, and then something to amplify the signal back to ...

Agree with the Hammond enclosures if you have the ability to machine the chassis. If you don't, I have ordered from Modulus in the United States without issues since I also wanted their aluminum JTM-style chassis and don't have the tools or space for machining that I would find visually acceptable (...

Curious, like others here, what you meant by "feed a speaker a half-wave signal". Best .. Ian I wondered if you could run two SE output transformers, with each power tube being fed by one plate of a phase inverter. Would the design goal be to simplify a stereo build by using the PI as a mixer? If s...

Why not just build a reactive dummy load and reamping device without necessarily copying the Power Station? It seems to me that there's enough information about the Power Station to inform tweaking a something of your own design, and there's a ton of information on the Fryette Youtube channel, inclu...

Build finished, fired up successfully. 316v plates – 10.3 cathode = 306v plate-to-cathode, 10.3v across 130R cathode resistor = 80mA, or almost exactly 100% dissipation, so that's nice. I have a LOT of noise at idle. It's not the gNFB, it's just a huge amount of gain following the Volume pot. If I ...

or 1980.. Picking caps by Walter Jung and Richard Marsh people knew more 100 years ago.. today again we need lo learn basics..and again and again....... https://milbert.com/Files/articles/Picking_Capacitors_1.pdf https://milbert.com/Files/articles/Picking_Capacitors_2.pdf This is exactly the kind o...

Really excited to see how this works out. I've been thinking of something similar out of a similar distaste for unused triodes. Based on the other thread, I take it that the input cap is to protect the MOSFET from DC on the input?

This is one of my favorite pics to demonstrate measurable differences exist between different dielectrics. Now, the hard part is quantifying that, and translating to how it will sound in a guitar amp. It's clear that one of these caps is superior if you're going for minimum THD, for something like ...

I think I got this to a place where it's behaving more like I wanted it to, so I thought it I'd pass on what I ended up doing and say thanks to everyone who helped me figure out how to get this working the way it does now. As a starting point, I wanted to see if reducing the voltage divider after V1...

I have a Hiwatt type build that has about 510-515V on the plates depending on the bias setting. It's had JJ EL34s for about a year now and I usually play it with the master all the way up through an attenuator, so I work them hard. No issues with them. Haven't tried other tubes in that amp besides a...

It'd be interesting to get into the science explaining why we think there may or may not be differences. It seems like it'll be an exercise in futility debating whether or not the difference is audible on an empirical level without some pretty rigorous scientific testing. FWIW, I do think there are ...

Coming back to this project. The more I think about it, I think my design goals are to make an amp that is rewarding for both lead single-note playing and for rhythm. Since I'm primarily a "leave the amp at one setting and adjust with the guitar's volume control" kind of player, it seems like the ke...

Congrats!

There is a key value that's incorrect. You currently have a 470K resistor where there should be a 470 ohm resistor. The layout for the phase inverter and schematic in the schematic document is correct, but the second layout is not. So yeah, the 470R at V3 should fix your issue.

The cathode bias resistor on V3 LTP should be 470R, whereas the value that seems to have been fitted looks like 470k. The effect that would have aligns with the reported symptoms. Good catch. Just noticed that mistake is there also in the layout portion of the layout provided at the bottom of the o...