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Post subject: Supersonic 112 Schematic
Posted: Tue Apr 19, 2011 10:26 am
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Does anyone have a PDF Schematic of the Super sonic 112 Combo. It's not listed in the support section. Thanks in advance. :)


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Post subject: Re: Supersonic 112 Schematic
Posted: Tue Apr 19, 2011 11:30 am
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I believe this is the one. It isn't labeled 112 but it covers that combo, and the head versions of the amp.

http://support.fender.com/schematics/guitar_amplifiers/Super-Sonic_Combo_schematic.pdf

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Post subject: Re: Supersonic 112 Schematic
Posted: Tue Apr 19, 2011 12:56 pm
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Awesome, thanks. BTW I'm not a super tech genius when it come to amps, but I've open them up and fixed small things like broken solder joints.
So how would I go about Biasing this amp? I've heard the ship them cold and would like to check mine and if it is, fix it.


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Post subject: Re: Supersonic 112 Schematic
Posted: Tue Apr 19, 2011 1:42 pm
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This amp is bias at rougly 15W for a max of 30W per power valves, not bad but not hot.

Bias is adjusted by the pot R156.

As an example : http://www.eurotubes.com/euro-Fender-HRDV.htm

Take care about lethal voltages on this amp !

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Post subject: Re: Supersonic 112 Schematic
Posted: Tue Apr 19, 2011 1:55 pm
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Thanks tis-san I will. I'll see if I can work on it either tonight or tomorrow and let you guys know what difference it made.
Cheers


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Post subject: Re: Supersonic 112 Schematic
Posted: Tue Apr 19, 2011 6:20 pm
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http://www.fender.com/community/forums/viewtopic.php?f=13&t=47161

covers all the bases here for the do-it urself bias on the ss22

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Post subject: Re: Supersonic 112 Schematic
Posted: Thu Apr 21, 2011 7:07 am
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Thanks all! Well, last night me and my dad adjusted the bias and it's defiantly made a difference. The biggest complaint I've read about these amps is the hiss, but if people would just take the time to do this their amp would sound great. :D


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Post subject: Re: Supersonic 112 Schematic
Posted: Thu Apr 21, 2011 11:42 am
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Also I've noticed that the reverb used to make a high pitched note if turned past 4-5. But now sounds great!


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Post subject: Re: Supersonic 112 Schematic
Posted: Thu Apr 21, 2011 11:59 am
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Always glad to hear of a successful amp setup, congrats. Do you remember where you set your bias, how many mV at the test point?

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Post subject: Re: Supersonic 112 Schematic
Posted: Fri Apr 22, 2011 10:10 am
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shimmilou wrote:
Always glad to hear of a successful amp setup, congrats. Do you remember where you set your bias, how many mV at the test point?


"I believe it was -54.5 mV"

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Post subject: Re: Supersonic 112 Schematic
Posted: Fri Apr 22, 2011 11:47 am
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Thanks Fender890Corey,

That looks like the grid bias voltage reading (C-), which would be -54.5 volts (negative volts DC), not mV, which is good to know, but most of us here are used to talking in terms of + mV readings at a bias test point on the amp. The bias setting determines the wattage dissipated by the outputs tubes at "idle".

If you check the top of the second page of the schematic, test points (TP), TP49 and TP50 each show 32 mV DC. These two TPs will read 32 mV each when the grid bias voltage reads -54.5 VDC, using the stock Groove Tube (GT) output tubes. At the above described settings, your amp is idling at roughly 15 watts per output tube, which is 50% of the total if you have 30 watt tubes. Most would agree that this is at the low end of an acceptable range of 50% to 70% idle for 30 watt tubes, or "biased cool" but still good. If you have 25 watt output tubes such as 5881s (quite possibly your stock GTs are the 5881s), then the idle that you have now is roughly 60% of this tubes wattage rating and still a good setting. I like my 5881s at about 55% to 60% idle in my HRDlx.

Either way, it sounds like you have your idle set right where you want it and it sounds good to you. Remember to check your bias if you ever replace the output tubes with anything other than the exact same type and color rating as your stock GT tubes. In other words, once your bias is set the way that you like it with a particular set of output tubes, and you replace those output tubes with the exact same type, the idle should still be the same with no adjustment necessary. But, if you change from say a blue label GT (low, 1 to 3 GT rating), to a Red label GT (high, 8 to 10 GT rating), or from a GT to another brand, you would want to check the bias again. :)

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Post subject: Re: Supersonic 112 Schematic
Posted: Fri Apr 22, 2011 1:22 pm
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shimmilou wrote:
Thanks Fender890Corey,

That looks like the grid bias voltage reading (C-), which would be -54.5 volts (negative volts DC), not mV, which is good to know, but most of us here are used to talking in terms of + mV readings at a bias test point on the amp. The bias setting determines the wattage dissipated by the outputs tubes at "idle".

If you check the top of the second page of the schematic, test points (TP), TP49 and TP50 each show 32 mV DC. These two TPs will read 32 mV each when the grid bias voltage reads -54.5 VDC, using the stock Groove Tube (GT) output tubes. At the above described settings, your amp is idling at roughly 15 watts per output tube, which is 50% of the total if you have 30 watt tubes. Most would agree that this is at the low end of an acceptable range of 50% to 70% idle for 30 watt tubes, or "biased cool" but still good. If you have 25 watt output tubes such as 5881s (quite possibly your stock GTs are the 5881s), then the idle that you have now is roughly 60% of this tubes wattage rating and still a good setting. I like my 5881s at about 55% to 60% idle in my HRDlx.

Either way, it sounds like you have your idle set right where you want it and it sounds good to you. Remember to check your bias if you ever replace the output tubes with anything other than the exact same type and color rating as your stock GT tubes. In other words, once your bias is set the way that you like it with a particular set of output tubes, and you replace those output tubes with the exact same type, the idle should still be the same with no adjustment necessary. But, if you change from say a blue label GT (low, 1 to 3 GT rating), to a Red label GT (high, 8 to 10 GT rating), or from a GT to another brand, you would want to check the bias again. :)


Ok thanks, the next time I change tubes I'll go in and get the correct voltage for you guys.

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Post subject: Re: Supersonic 112 Schematic
Posted: Fri Apr 22, 2011 2:28 pm
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Cool! The main reason that I pointed this out is that adjusting the voltage reading at C- to be the same with different output tubes, will result in quite a difference in output tube idle of each different brand/type of tubes. So, since each type of output tube can have a different idle wattage with the same voltage setting at C-, the TP for the output tubes will give you a more accurate assessment of your actual idle than the reading at C-. :idea:

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