The Amp Garage

xtian wrote: ↑Tue Mar 11, 2025 3:36 pm I did not replace the snubbers. Amp is quiet at idle, no buzzing or humming.

Can't say I've ever heard a difference with and without.

I'm guessing it's more about EMI since commercially sold amps are subject to a lot more regulations nowadays.

FYI I figured I'd post here, Kurtus asked that I delete his account and all posts. It's been done. I asked xtian and he felt his posts were a landmine of bad information for users and should likely be removed to clear up any risk there. I'll delete the other threads entirely as well. ~Phil Unfortun...

Note: one dowside of the 470k/10k divider isolator circuit is the load dependant attenuation. Where you get 35dB attenuation into a 1M load, you get almost 41dB into a 10k load (e.g. line level device).

If the signal level whete the fx loop is to be inserted is high, then a resistive potential divider can be used to reduce the send signal level and impedance to a reasonable level. eg 470k - 10k provides a send impedance a little under 10k, even lower if a 10k pot is used for ghe send level, which ...

Do you really need the boost on the send? Is the return gain not enough? As already mentioned, it's not about gain (in fact you usually want attenuation there), it's about output impedance. The output impedance of whatever is driving the FX send will form a low pass filter with the capacitance of t...

does the presence control help? are you looking for low or hi mids? Thanks for your reply. Low mids primarily, the idea is to get it to work with a Strat. For a Strat I'd day the main goal should be to reduce the high mid emphasis early in the circuit. As others have said, a 2n2 cap on the treble p...

How do you guys assemble cabs - heads, combos or speakers alike... Traditionally, dovetails seems to be the preferred method, but several joint tests made on YT clearly indicates that common miters makes the strongest glued joint... can even be reinforced by some dovels in booth direction... After ...

award70 wrote: ↑Fri Apr 12, 2024 5:28 pm This seems ridiculous but people that review "audiophile" fuses say they make a difference. What the heck is going on?

https://www.stereophile.com/content/hifi-tuning-fuses

Probably has nothing to do with the fact that these websites earn revenue from advertising for these companies.

What about Soldano? How the heaters are wired on an SLO flies in the face of everything posted here. So I think heater wires are not as critical as some make it out to be. Yup, I don't bother with twisting for the preamp anymore, just run short straight parallel wires from socket to socket. I do DC...

I was interested in the composition of Orange Dual Dark, so I looked at the related circuits. I can't find Dual Dark's official circuit, so I have to guess, but judging from the tube layout, I'm guessing that the Jim Root Terror and Dark Terror preamps are probably assigned to each channel and swit...

Transistor is used if you need to switch multiple relays from one switch. Also you can use LED indicator either in the amp or in the pedal without needing any additional circuit. Just connect a LED from CTRL to ground and when you short CTRL to ground the relay switches and led turns off. Hey, than...

I haven't twisted filament wiring in years, I can't hear any hum so I don't bother.

DC elevating them makes a much bigger difference (as in the hum disappears entirely). Maybe it's because they're elevated that non-twisted works well.

Thanks for the photo and info. Looks great! Yes, I wondered if the 47R resistor was worth the trouble, so it's interesting to hear that you decided to remove it. Thanks for the good info re the FET boost, too. I have a build coming up that will use one, so I may try your method with the higher valu...

Very cool build, Snicksound. I know you no longer have the amp, but do you have any guts photos you could share? Curious to see the final board and layout. Also, I have a couple of questions, if you don't mind: 1. The 47R resistor after the rectifier, how did you arrive at the value? 2. About the F...

This will probably be the last post on this amp as it's going to its new home tomorrow. See below the final schematic and a potato quality demo. I did get to play one gig with it and it was GREAT. I found the boost to be a bit intense for some songs so I complemented with my pedals. When I wanted pr...