Tube Amp Archive

V4+V5 = silence
V3+V4+V5 = silence
V2+V3+V4+V5 = small hum
V1+V2+V3+V4+V5 = big hum, hiss and crickets
sound is a good quality after all

I think I know what is the problem

Rooster - thanks my friend :) 6n2p-ew is the same as ecc83 and 12ax7 only filament is a little bit diferent: 6,3V on pin 4 and 5. Pin 9 is a internal shield. I rewired V1 and ecc 83 is the same noisy as 6n2p but the sound is warmer. Ill think about filament switch on V1 I bought something today - it...

Humfighting part 2

after replaced rest of pots 50Hz hum still live
I replaced V1 shield wires - yellow wires are copper shielded - less microfonic
When I took off V1 and V2 hum desapeared. Now Im thinking about DC filament to preamp tubes
any sugestions?

I have a choke: 8,1H 140mA 173 ohm
Will be enough to rocket?

walnut or not - never mind - nice faceplate
In my express faceplate will be with oak.

wow! very nice walnut faceplate

thanks Mr Roooo :) after long fight I found (probably) the source of hum. F****** pots! I replaced vol pot. Now power hum is a half less, unfortunately I havent the rest pots to replace. Today I wisited electronic flea market. I didnt find any old school 1M pots! But I find some other things :) :wink:

I am not disapeared yet
Now I fight against hiss/hum. My NOS pots havent grounding shafts! After eliminated that ground loop hum still egsist
any sugestions?

Your friend professional player play gig without PA? its very strange to me
enyway - to increase amp vol you may:
change OT trany from 6600 to 5200 ohm
use big number of speakers

rooster - my amp work very good! (see pic 121) 8) look at my first post :lol: pin 9 its a internal tube shield grounded to brass heaters are 4 and 5 preamp tubes arent 12AX7 or ECC83 :shock: There are 6n2p-ew USSR military equipment surprised? :wink: BTW my wood faceplate will be about 4mm thick

I hadnt time on this week but amp working again Woodworking and V1, 2pin to vol wire is shield wire replaced

I have a question: wood front pannel will be gluing to brass or not?

front pannel without pot presence hole

In my opinion - strip, and build once again

breakfastbuddy Ill try to answer This solution is simple only on first wiew For me it was simple, becouse this kind of tranny series ZATRA TS50 are well known as good to use as OT. I calculate a primary impedance and choose one of this. First you must know how many turns your tranny have a primary. ...

rooster,
I was deeply moved by your post. What am I say? Thanks Brother!
This motivate me to next TW projects. (yesterday I bid next PT as OT transformer
Now you know my philosophy - a different wiew to ordinary things.

I rest in sunday and wisited my mother - only one pic below