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Indeed G3 Bias Procedure & Tube Rolling

post #1 of 6
Thread Starter 

So I got a multi meter, and a 12UA7 tube... what do I need to do to roll in the new higher volt tube?

 

Looking into modding this soon. and pictures would be magical :D. I've also got the "Bias Mod" as recommended on Rock Grotto already established in my unit! 

post #2 of 6
Quote:
Originally Posted by Mshenay View Post

So I got a multi meter, and a 12UA7 tube... what do I need to do to roll in the new higher volt tube?

 

Looking into modding this soon. and pictures would be magical :D. I've also got the "Bias Mod" as recommended on Rock Grotto already established in my unit! 

Might find some answers on this thread

http://www.head-fi.org/t/412353/a-new-hybrid-from-indeed-hi-fi-labs-does-this-look-fun.

 

Bravo owners might be able to offer advice.

http://www.head-fi.org/t/444400/bravo-audio-funny-looking-little-tube-amps.

 

Also the website Rockgrotto has a subsection on their forum where all they talk about these amps and do mods for these kind of tube amps.

post #3 of 6
Thread Starter 
Quote:
Originally Posted by PurpleAngel View Post

Might find some answers on this thread

http://www.head-fi.org/t/412353/a-new-hybrid-from-indeed-hi-fi-labs-does-this-look-fun.

 

Bravo owners might be able to offer advice.

http://www.head-fi.org/t/444400/bravo-audio-funny-looking-little-tube-amps.

 

Also the website Rockgrotto has a subsection on their forum where all they talk about these amps and do mods for these kind of tube amps.

Do you have a link to that thread on the Rock Grotto Forum. It'll b in tommorow. So after a lengthy review, I'ma roll them tubes and try it out again! 

post #4 of 6
Quote:
Originally Posted by Mshenay View Post

Do you have a link to that thread on the Rock Grotto Forum. It'll b in tommorow. So after a lengthy review, I'ma roll them tubes and try it out again! 

http://rockgrotto.proboards.com/index.cgi?board=b

post #5 of 6
Thread Starter 
Quote:
Originally Posted by PurpleAngel View Post

http://rockgrotto.proboards.com/index.cgi?board=b

Omg I think this is what I need to do! 

Warning: PICTURES (Click to show)

 

 

 

 

OK.... just finished the pics.....

R3 and R13 are the measuring points (200 ohm).

The easiest way is to solder on a couple of temporary "tails", thus:

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Set your multimeter to the ohms range and connect the left tail to the red lead on the multimeter and connect the black lead to ground (I just clip it on the ground part of the phono socket)

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DSCN2268.jpg


Adjust here:

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Until you get close to 13.5V

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DSCN2267.jpg


Do the same on the right hand channel and adjust with the R/H trim pot.

Allow the amp 30 minutes to warm up before adjusting.

Easy as that ;)

 
 

 

 

 

I think that's what I need to do, it's good to see that all I need to do is get a philps head and  Digi Multi Meter. I had an analog one but... for adjusting from 13v to 13.5... the multi meter I have isn't that fine... it would be ahrd to read so let's hope my step father brings his Digital one... although is pretty pissed off at me atm 

 

Can any one recommend me a Good inexpensive Multi Meter incase I need to purcahse one for my self. Or I'd LOVE to buy a used one off you guys <3 

post #6 of 6

Hi everybody

 

I am just buy two nos tubes to roll but both of them has one channel sound, only left channel is working. But when I get back to electro harmonix (default tube) both channels working. 

 

Is this a bias issue or tubes are wrong?

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