Projet G5

hey vitriol82

i put the power resistor for B+ on the free pin6 to pin4!

phase inverter is pin3 with pin8 connect...

i think for the clean headroom is 500 V good or not?

raffa

EDIT

okay guys finally the amp is done and work very well....yes! :D

i made another filter stage in the power ...

okay here are tensions with the working tubes...

V1
pin
1. 191.5
2. 0.026
3. 2.45
6. 281
8. 2.3

V2
pin
1. 332
2. 42.7
3. 73.5
6. 314
7. 45.3
8. 73.5

V3
pin
3. 499
4. 492
5. -43.5
6. 496

V4
pin
3. 499
4. 492
5. -43.5
6. 496

For power supply: secondary HT

A -> 499V, B -> 495V, C ...

okay, had time on the weekend...

when i remove the Phase Inverter Tube....the amp works....i can adjust the bias...with all diffrent tubes...it seems okay, but since i connect the Pin3 and Pin8, withhin i resolve the loudness (volume) problem, the bias goes up to 120 ma with the PI tube in....and ...

hey guys...i found the error! i forgot the connection pin3 to pin8 on V2!

--> now the amp works... :P

but one issue left me in misery...when i put 2 new el34 in the amp, bias on -45V...the bias current goes up to 200ma and the tubes buzz and i have to shutdown the amp....

when i put my practice ...

its very silent, quiet! i have to turn the MV all way up to hear something....

what kind of problem cant this be?

raffa

hey guys,

i'm back....with good news!

THE WORKS!

changed the bias, the trace, the choke possison, star ground and of course the tubes....

and it works like a charme! no buzz quiet like a baby!

but one problem....is damm sillent! when i put the gain and the MV on 10 it sounds normal bedroom ...

why? i have a bias winding on this trafo? i don't understand?

hey, will do it...but befor i start, can you say me wich is the good bias system?

i use a Hammond Drossel 159M (Inductance: 15 H, DC Current: 100 mA, Resistance: 256 Ohm, Max. DC: 500 V)

more to follow

merci beaucoup.... i use epi les paul studio, and telecaster...sometimes a strat...we play alternative brit sound...some sort of the martins! yeah TBO nice sounds! 8)

back to topic...how can i decrease the current on this amp? bias okay...but the current!

yes, i changed it allready....pics will follow

hmm....i must check the bias circuit again....think i have a error there....give me 20 min

EDIT MODO

okay...i've done the C700 bias circuit like this --> http://gilles.thebault.free.fr/IMG/jpg/MI60_original.jpg ....the volltage is okay...but the current a way to high with near 100 mA...my bias pot ...

no, the heater with all tubes in is 6.83V!

i meassed around with the bias current...when i put the bias current down to 10 mA the buzz goes a little bit gone....still here but not to loud....

then i checked the bias circuit and find out that i don't have a resistor parallel to the cap! thats mean ...

sorry...i d'ont have more information about the PT....as i say!

i took this out from a hybrid amp with 1 12ax7 an 2 6c6 tubes....

what about the wiring? can i put some signal wires up on the same line with the ground wires?

i try to put of one pre-amp tube...

okay...i removed the resistor....and now i'm in the ball park....bias is about -37.2V and the current about 39 mA...

i drilled the heater cable and cleaned the amp up...


but unfortenatly the buzz is still hear... :cry:

AMP BUZZ Soundfile here --> http://www.cshare.de/file ...

hey guys, whats up?

can someone help me out! please