champion 600 rebuild - excessive hum

[camintsev]

Need help, because I'm losing my hope. I've built several amps, but last two rebuilds made me puzzling the most. Amps are champions 600, converted to PTP...

[Ben N]

So we got her up and running fine. But I'd like to have line voltage switchable, without cutting or drilling the chassis. I've got some recessed slide switches,...

[glowysourworm]

I'm wondering if anyone can help - I've just got a freshly wired 5F1 and am having a problem.

When starting the amp up with no tubes the pilot...

[teletwanger48]

I have a Champ 12 (USA made) and it all of a sudden started sounding like a busted speaker. I was playing at a low volume and it was sounding fine until then....

[teletwanger48]

I recently acquired a Fender Cham 12 in dead mint condition. This one looks exactly like a blackface with the silver grill cloth.

. It is...

[eschertron]

Respected experts, mavins, friends: lend me your eyeballs

I received a 78 SF champ yesterday off of ebay. It does seem to be authentically...

[ScarTube]

Hello people,


i´me building the Champ 5C1 schematic. Its my fifth DIY-amp project and I really love it. Everything works and sound...

[blueguitar]

Hi everyone

I am looking at my first build and figgured I'd start with a kit build of a champ or something similar. Just wondering what people...

[doldrumdesign]

I just bought a Kalamazoo Model 2 recently and have been slowly going through it. First I swapped out the two prong for a grounded three prong plug, moved...

[downsizingnow48]

I have used a Mesa Boogie Quad Preamp with stereo effects and a 50/50 stereo power amp, or a 20/20 stereo power amp, for years. I really like the sound of...

[dchang0]

Hi, all--

I'm adding a 6BM8 one-tube reverb circuit taken from what I've been told is a modded JTM45 schematic* to my 5F1 Champ. I'm basically...

[dchang0]

I love the tiny size of the original "The Champ" wide panel amps. Does anyone sell a true-to-original clone cabinet (and matching chassis, though...

[yodaeatsfishstx]

So i'm about to buy the parts for my first build and I'm wondering, based on other people's experiences, what is a better way to go for a kit, weber or mojotone?...

[priesty]

Finished my second "PriestyAMP" project, a single ended amp based on a Blackface Champ aa764. It has the following design features I incorporated:...

[Tonewood]

I was about to copy a James stack from a book I have into a Champ & then noticed many different versions of the stack online. (very different R/C combos)...

[Tonewood]

I found the following on the Paul Ruby site Paul Ruby Amplifiers

"Warning!! All amps have some form of DC referencing of the filament...

[brewbaker]

My BF Champ has a 4.7uf cap alongside that 1500K resistor going to the first preamp tube. Can't remember why that value since this amp has been moddded a...

[HansVG88]

I am working on my first amp build based on a champ 5f1. I have installed a external speaker jack that switches so the internal (4 ohm) will not play when...

[HansVG88]

I built a 5f1 champ type amp and because it had hum issues I used a twisted pair heater from the 6.3 volt PT (green) wires. There was no center tap from the...

[HansVG88]

Hi all.
I am new to this forum and new to building. I stumbled on it searching for information about building a 5f1 Champ-like amp and troubleshooting...

[duffy878]

First off... the amp in question is a single ended kinda-champ style amp with a 12AX7 pre and 5881 power tube with SS rect. It has one input, a gain control,...