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Posted: Mon Dec 13, 2010 8:21 pm
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iamsomewhere wrote:
Thanks for everyone's help. I finally got it figured out and dialed in.

There is one more question I have though. There is about a 1mv difference between V1 and V2 (23.4 - 24.4)... I'm assuming that is normal, but just wanted to double check.


I think that you mean V6 and V7, the output tubes. And what Retroverbial said is also true of the output tubes, slight imbalances are normal. A difference of 1 mA out of 24 mA is less than 5% difference, very good. :)

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Post subject: Re: Super-Sonic 22 Bias Level
Posted: Mon Jan 03, 2011 3:17 am
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Hy, can someone send me a Fender supersonic 22 schematic copy, the link on fender forum is unvailable.

Thanks alot
Pat


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Post subject: Re: Super-Sonic 22 Bias Level
Posted: Mon Jan 03, 2011 9:38 am
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Hi nurnpat,

Send it where? :lol: There is a link that was earlier in this post, but it doesn't seem to work now, maybe you could try it (link below). If the link doesn't work for you, send me a private message (PM button below post) with your email and I can send a pdf copy of the schematic as an attachment. :)

http://www.imaginedesignworks.com/misc/ss22.pdf

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Post subject: Re: Super-Sonic 22 Bias Level
Posted: Mon Jan 03, 2011 12:48 pm
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Hy, sorry my mail is: nurnpat@hotmail.com
I don't know why but PM appear to don't work!
:oops:


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Post subject: Re: Super-Sonic 22 Bias Level
Posted: Mon Jan 03, 2011 1:22 pm
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It's working OK, I got all three of your tries. :lol: I sent you an email with the schematic attached. :)

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Post subject: Re: Super-Sonic 22 Bias Level
Posted: Fri Feb 04, 2011 4:00 pm
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@shimmilou: Thanks for all the information!
Just to clarify: Are you suggesting to set the plate current for the SS22 to 21mA rather than 24mA as written in the schematic or just that the actual Cathode current is about 3mA lower?

Thanks!

>The schematic does show 24 mV (therefore 24 mA) each tube for the Cathode current. The Cathode current will be a few milliamps higher than the Plate current, and the Plate current is what we are really concerned with. So just subtract 3 mA to be conservative and call it 21 mA Plate current. At 21 mA Plate current and 415 Plate volts, that is 8.7 watts of idle dissipation for the 6V6 tube. The 6V6 tube is rated for 14 watts, and you typically want to set the idle somewhere between 50% to 70% of the tubes rating, or between 7 watts and 9.8 watts idle. The conditions indicated on the schematic would give approximately 8.7 watts of idle, which is in that range of 50% to 70%, right in the middle, just on the warm side. <


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Post subject: Re: Super-Sonic 22 Bias Level
Posted: Fri Feb 04, 2011 9:18 pm
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Hi thereverend,

The test point reading shown on the schematic in mV, is the same as the Cathode current in mA, and the Cathode current is a few milliamps higher than the Plate current. To get the actual Plate wattage dissipation at idle, you multiply the Plate current by the Plate voltage. On the schematic, the test point reading of 24 mV is the Cathode current for the tube, as mV across a 1 ohm resistor can be read as mA. So if you read 24 mV at the test point, that is 24 mA of Cathode current, which is about 21 mA of Plate current. In other words, in this case, 24 mA Cathode current (24 mV at test point) will be about 21 mA Plate current. :)

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Post subject: Re: Super-Sonic 22 Bias Level
Posted: Sat Feb 05, 2011 12:46 am
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shimmilou wrote:
Hi thereverend,

The test point reading shown on the schematic in mV, is the same as the Cathode current in mA, and the Cathode current is a few milliamps higher than the Plate current. To get the actual Plate wattage dissipation at idle, you multiply the Plate current by the Plate voltage. On the schematic, the test point reading of 24 mV is the Cathode current for the tube, as mV across a 1 ohm resistor can be read as mA. So if you read 24 mV at the test point, that is 24 mA of Cathode current, which is about 21 mA of Plate current. In other words, in this case, 24 mA Cathode current (24 mV at test point) will be about 21 mA Plate current. :)



Thanks very much, shimmilou! Very clear explanation, now even I understood. :P


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Post subject: Re: Super-Sonic 22 Bias Level
Posted: Fri Feb 25, 2011 8:57 am
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hey reverend~
great great post here!
THANKS to ALL the kind people who posted!!!
Shimm, you the man

I have a QUESTION for reverend, is there any trick to the top screw clips on this SS 22, because when i look at the bottom of the chassis, those screws (4) all have just round nuts (sorry haha), but for real they do, so is there a trick to these?
I know about the 3 screws on the lip of the chassis.
On other fender combo's, I have seen the regular hex nuts on the screw clips....

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Post subject: Re: Super-Sonic 22 Bias Level
Posted: Fri Feb 25, 2011 9:40 am
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I could use a pic of the schematic plz! arent these a fixed bias amp? My Engl was the same way with just one trim pot and it wouldnt allow you to go to high on the bias. We did check the bias and then adjusted by ear. So are these amps set cold?


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Post subject: Re: Super-Sonic 22 Bias Level
Posted: Fri Feb 25, 2011 11:41 am
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twirlyboggs wrote:
hey reverend~
great great post here!
THANKS to ALL the kind people who posted!!!
Shimm, you the man

I have a QUESTION for reverend, is there any trick to the top screw clips on this SS 22, because when i look at the bottom of the chassis, those screws (4) all have just round nuts (sorry haha), but for real they do, so is there a trick to these?
I know about the 3 screws on the lip of the chassis.
On other fender combo's, I have seen the regular hex nuts on the screw clips....


I don't really know what you question exactly is....??? You just unscrew the top ones, like in any other fender amp I know....no difference.

I have only the printed schematic, may someone else has a .pdf file????

Also, it has a bias pot. It was biased cold, but not very much off....


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Post subject: Re: Super-Sonic 22 Bias Level
Posted: Fri Feb 25, 2011 11:48 am
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any favorite 6v6's?
http://www.dougstubes.com/6v6.htm



at7 could be sweet
http://www.dougstubes.com/images/mullardcv4024.jpg


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Post subject: Re: Super-Sonic 22 Bias Level
Posted: Fri Feb 25, 2011 11:57 am
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ken361 wrote:


I really like the TUNGSOL Reissues and also the new TAD STRs...


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Post subject: Re: Super-Sonic 22 Bias Level
Posted: Fri Feb 25, 2011 4:33 pm
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I ordered a tungsol for the V1 should help brighten the gain channel up, mines lacking treble on the burn channel with the sg, need presence


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Post subject: Re: Super-Sonic 22 Bias Level
Posted: Fri Feb 25, 2011 8:03 pm
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i guess i am going to put some JJ6V6's and some electro harmonix 12AX7 (3) and 12AT7 (2) one o fthem balanced for the PI - I will post my results when i do....
My Twin i retubed with just all (pre& power amp) Electro-Harmonix & it was an improvement to the GT's that came new when i ordered the amp, except the reverb 12AT7 was a lil on the gainy side, the reverb IF set high would get get a lil fizzy. But I always set it around 2-3 so I did not have an issue. I would also say that the EH made the amp have a lil more gain, but tighter, on the dirty channel. This is my pro-tube Twin~Amp 100W btw.

On the other hand, on my Champ, when i went from a electro-harmonix 6v6 which came with it to a JJ6v6, the results were awesome! The breakup was less harsh and more warm and just in there if you know what i mean.

So i am kinda back & forth on JJ or EH for the 6v6 pair.

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