Tube Amp Archive

It sounds really good. Such a clean amp.

I like tone of the parallel preamp tube, especially with my jazzmaster.

I'm going to experiment with some cap values to make it more humbucker friendly.

Star grounding was the culprit.
Noob move on my part. I feel ashamed.

Changed my grounding so all power grounds went to one, and all signal grounds to another... And voila.

Silence.

Thanks to all for your pointers. It helped.

Cheers.

Parallel

So it's 120 cycle hum. And my voltages are as follows. B+ 376v After 4.7k resistor = 324v After 22k resistor = 262v V1 anode = 46v (v1 is parallel, with 220k plate resistor) V1 cathode = 0.74v V2a anode = 179v V2a cathode = 1.2v V2b anode = 219v V2b cathode = 41v I disconnected the heater virtual gr...

I have a virtual center tap on the heaters, 2 - 100 ohm tied to ground. The reason i suspected it to be the phase inverter, was because the hum is still present when i pull the first preamp tube out. And the hum goes away with the phase invert tube out. I'll get some plate / cathode voltages tonight...

:wink: So, I have a 5e3 amp that i built from spare parts. And whenever I put a 12ax7 in the phase inverter, it makes the amp hum. The hum is present with the volume turned all the way down. It goes away as your turn the volume up to about 2 or 3, But then returns around 4. It sounds kind of like ba...

I bought this old Wurlitzer Organ tube amp for 35$. push pull 6L6's, with 5u4gb rectifier. the amp is immaculate. I dont know much about field coil speakers, so i was wondering what the secondary wires are for on the output transformer, as i think they are slightly different than guitar amp output t...

i think that helps a lot.

i searched some other covers, and that thats really close to what i'd like to learn.

thanks jam

Periphery - Juggernaut : Alpha & Omega

Stranger things is a really cool song

can anyone tell me what song this guy is playing at 2:25?

its the rockabilly / Chet Atkins style riffs.

Just curious if this is from a particular song, or if he's just noodling.

I'd like to learn that progression, or that style.

https://www.youtube.com/watch?v=iLfJfmJwl3c

Thanks Joeboo, I found these stand off type spacers from homedepot, that just happen to have the same thread and height of the old transformer mounting bolts, they are round tho, so they were hard to tighten. It was definitely easier to work with on the inside, as space was limited in the hammond 16...

Hello all, I got this amp working in January. And have since been tweaking the circuit as I chipped away at the head-shell and cabinet. its not 100%, but I was itching to show you all some pictures as I'm super proud of this amp. and I figure its far along enough to show. Specs / Mods Vintage Transf...

https://www.tubesandmore.com/products/P-47

i use this bulb with the fender style lamp.

and hook it up to the filament supply, rather than the 120.

I used the same for my express, with no problems.

Could your fuse blow if you use the wrong bulb?

TUBESWELL, thanks a million!

Just the info i was looking for.