6N1 + 6P3P build, need some help.

[marmot19]

Hi guys, i'm building a 6N1 _ 6P3P kit and I'm having a problem of volume. Ipod + Preamp + amp is playing very low..

Anyone have ideas about to solve that issue ?

Thanks !

 

[ballpencil]

Did you check the bias voltages? Assuming it's the kit from siliconray, there should be about:
> 120v on 6N1 plate
> 1.75v on 6N1 cathode
> 19v on 6P3P cathode

If everything checks out, try removing the feedback resistor.

If it's not the siliconray kit, a schematic would help.

 

[marmot19]

Did you check the bias voltages? Assuming it's the kit from siliconray, there should be about:
> 120v on 6N1 plate
> 1.75v on 6N1 cathode
> 19v on 6P3P cathode

If everything checks out, try removing the feedback resistor.

If it's not the siliconray kit, a schematic would help.

Hi Ballpencil, Thanks for helping...

I mesure the exact same voltage @ +/- 2 volts for 6N1 Plate. This is not a kit from sillicon ray but it is basically the same, but I have received another schematic than the one from sillicon ray..

I'll try to join the schematic, pardon me if it dont work, i'm new to the forum...

 

[Renslipevol]

Correct me if I am wrong but I would think 100k is not enough of a load for the Ipod. You have an impedance issue.

 

[ronaldw441]

The more recent Siliconray kits use the same schematic.

 

[marmot19]

The strange thing is that both channel are equally low, by there, I'm guessing that the OT are ok/or both in problem ?!

PT might be good as I have the require voltages.

What should I know about Ipod + preamp + power amp impedance ?

 

[ronaldw441]

Post a photo showing how you have the volume pot wired.

 

[ballpencil]

Schematic looks fine so if you follow it as shown, there should be no problem.
If you have confirmed these voltages:
> 120v on 6N1 plate --> confirmed OK as you said
> 1.75v on 6N1 cathode
> 19v on 6P3P cathode
then most probably it's a miswiring or the wrong part on the wrong position.

 

[mcgowaw]

did the OP fix this issue with the impedence mismatch for the mp3 player?
tony

 

[mcgowaw]

marmot19, not sure if you're still on here but thanks much for the 6n1/63p3/5z4 schematic. much more helpful than the chinese one.
hey norm, if you're still active on this forum.
tony

 

[xlinuxer]

u can measure the B+ ,it is about 300V . try to replace the feedback res(2k) with 10k . if it can do nothing , just change the OP's wire : blue(8ohm) 2 black (0 ohm) , and
try again ,may be it is work!
sorry , i can not put pic on!
good lucky to u.