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Post subject: Super 210 Optional Bias Mod
Posted: Tue Aug 25, 2015 10:08 am
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I wanna replace the power tubes on my Super 210 and have the bias pot mod done at the same time. I'm playing telephone tag with my tech.. he left me a message to email him info on this mod. Is there a site that explains the mod and how it's done?

Thanks,
Adam


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Post subject: Re: Super 210 Optional Bias Mod
Posted: Tue Aug 25, 2015 1:40 pm
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Any other model name like AB763 to find schematic ?

This amp ?
http://ampwares.com/amplifiers/fender-super-210/

Is this one ? Bias circuit is optional

What bias mod are you talking about ?


http://el34world.com/charts/Schematics/ ... er_amp.pdf


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Post subject: Re: Super 210 Optional Bias Mod
Posted: Tue Aug 25, 2015 1:46 pm
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stratele52 wrote:
What bias mod are you talking about ?


If you google Super 210 Optional Bias Mod it'll come right up. The amp is fixed bias, but there is an official mod that can be done to install a bias pot into the amp. the Super 210 is just a Super 60 with 2x10"s, instead of just 1x12".


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Post subject: Re: Super 210 Optional Bias Mod
Posted: Tue Aug 25, 2015 1:54 pm
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Adam O'Blivion wrote:
stratele52 wrote:
What bias mod are you talking about ?


If you google Super 210 Optional Bias Mod it'll come right up. The amp is fixed bias, but there is an official mod that can be done to install a bias pot into the amp. the Super 210 is just a Super 60 with 2x10"s, instead of just 1x12".



Google don't show any mod for me . Any link ?

I understand youre tech is looking for more information , why he don't google bias mod ?


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Post subject: Re: Super 210 Optional Bias Mod
Posted: Tue Aug 25, 2015 2:42 pm
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stratele52 wrote:
Adam O'Blivion wrote:
stratele52 wrote:
What bias mod are you talking about ?


If you google Super 210 Optional Bias Mod it'll come right up. The amp is fixed bias, but there is an official mod that can be done to install a bias pot into the amp. the Super 210 is just a Super 60 with 2x10"s, instead of just 1x12".


Google don't show any mod for me . Any link ?

I understand youre tech is looking for more information , why he don't google bias mod ?


Here's a link from the Tele Forum discussing it :

http://www.tdpri.com/forum/amp-tech-cen ... t-mod.html

I'm just looking for something a bit more official to send him.

There are two local techs that I've dealt with before and trust. One of them knows of the mod and quoted me at $90 to perform the mod and install/bias new power tubes (that I buy and bring in). The other tech is the one requesting info. The reason I wanna go with him is because he'll let me sit in during the process. I want to learn how to bias my own tubes. I'm really interested in the tech side of things...not to mention that it'll save me lots of cash doing these things myself.


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Post subject: Re: Super 210 Optional Bias Mod
Posted: Tue Aug 25, 2015 3:32 pm
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The link you show just talk about tubes , not how to built a bias circuit .

You want a pot to adjust bias yes ?

The bais mod you are talking about it is a pot with their circuit show on the schematic I give you the link .

Your tech have just to built it as show on schematic . If he don't understand , run away from him :lol:


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Post subject: Re: Super 210 Optional Bias Mod
Posted: Tue Aug 25, 2015 4:16 pm
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stratele52 wrote:
The link you show just talk about tubes , not how to built a bias circuit .

You want a pot to adjust bias yes ?

The bais mod you are talking about it is a pot with their circuit show on the schematic I give you the link .

Your tech have just to built it as show on schematic . If he don't understand , run away from him :lol:


Ha Ha! Yer last line says it all. I don't think this guy is computer savy in the least.. It was obvious by the terms he used to request "the internet" information. I know that Fender has an official name for the Mod, something creative, like "Optional Bias Mod." I don't know what to send him besides these forum threads.

It'd rule if you could send me that link you mentioned.

Thanks,
-Adam


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Post subject: Re: Super 210 Optional Bias Mod
Posted: Tue Aug 25, 2015 4:21 pm
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stratele52 wrote:
Any other model name like AB763 to find schematic ?

This amp ?
http://ampwares.com/amplifiers/fender-super-210/


That's the one.

stratele52 wrote:
Is this one ? Bias circuit is optional

What bias mod are you talking about ?


http://el34world.com/charts/Schematics/ ... er_amp.pdf


I'm not technical at all so that schematic is spaghetti to me. I hope that one day it will make sense to me. The schematic mentions a "Fender Super," but that could be a different amp. Thanks.


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Post subject: Re: Super 210 Optional Bias Mod
Posted: Tue Aug 25, 2015 4:26 pm
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Adam O'Blivion wrote:
[

Ha Ha! Yer last line says it all. I don't think this guy is computer savy in the least.. It was obvious by the terms he used to request "the internet" information. I know that Fender has an official name for the Mod, something creative, like "Optional Bias Mod." I don't know what to send him besides these forum threads.
Send it the schematic , look at the link I show you at 16;46, the second link at the end of my answer
It show Optional Bias mod


Spaghetti ....It is clear and easy for a tech . That is exactly what it need to do the job



It'd rule if you could send me that link you mentioned.

Thanks,
-Adam


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Post subject: Re: Super 210 Optional Bias Mod
Posted: Tue Aug 25, 2015 4:27 pm
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Adam O'Blivion wrote:
[ The schematic mentions a "Fender Super," but that could be a different amp. Thanks.



I give up ,


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Post subject: Re: Super 210 Optional Bias Mod
Posted: Tue Aug 25, 2015 4:57 pm
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stratele52 wrote:
Adam O'Blivion wrote:
[ The schematic mentions a "Fender Super," but that could be a different amp. Thanks.



I give up ,


I believe that the Fender Super schematic you posted above is this amp:

https://en.wikipedia.org/wiki/Fender_Super

I noticed an effects loop in the schematic; the Super 60/210 doesn't have one.
stratele52 wrote:
Adam O'Blivion wrote:
[

Ha Ha! Yer last line says it all. I don't think this guy is computer savy in the least.. It was obvious by the terms he used to request "the internet" information. I know that Fender has an official name for the Mod, something creative, like "Optional Bias Mod." I don't know what to send him besides these forum threads.
Send it the schematic , look at the link I show you at 16;46, the second link at the end of my answer
It show Optional Bias mod


Spaghetti ....It is clear and easy for a tech . That is exactly what it need to do the job


Are you referring to the .PDF link in your previous post?


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Post subject: Re: Super 210 Optional Bias Mod
Posted: Wed Aug 26, 2015 1:18 am
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If you wrote to Fender consumer relation and ask about Super amp 210 schematic , that is the one they will send you.
The one I give the link before ;

http://el34world.com/charts/Schematics/ ... er_amp.pdf

For a qualified tech ,a bias pot is the same in any Fender *amp wich use one , most of them if you look at any blackface 's shematic and layout .
*Or any other amp brand
* A qualified tech should have lots of these shematic in his shop

Your amp have a fixed resistor and you want a adjustable resistor ; a pot

Short answer ; Your tech just have to replace this resistor by a pot . No need schematic to do the job .

If your tech don't know what I'm talking about , run away from him ,he is not a tech just a handyman.


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Post subject: Re: Super 210 Optional Bias Mod
Posted: Wed Aug 26, 2015 1:57 am
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stratele52 wrote:
If you wrote to Fender consumer relation and ask about Super amp 210 schematic , that is the one they will send you.
The one I give the link before ;

http://el34world.com/charts/Schematics/ ... er_amp.pdf

For a qualified tech ,a bias pot is the same in any Fender *amp wich use one , most of them if you look at any blackface 's shematic and layout .
*Or any other amp brand
* A qualified tech should have lots of these shematic in his shop

Your amp have a fixed resistor and you want a adjustable resistor ; a pot

Short answer ; Your tech just have to replace this resistor by a pot . No need schematic to do the job .

If your tech don't know what I'm talking about , run away from him ,he is not a tech just a handyman.


This guy is one of the best techs in the area. I left him a message about what I wanted done...I'm guessing he thinks there's more too the mod by the way I phrased it. I just called it the "Optional Bias Mod."
In the same light, Fender probably sent you that schematic cuz u wrote "Super Amp 210," instead of "Super 210." They might have thought you had a Fender Super w/ a 2x10 cab.
I'll call him tomorrow and explain what I want done more clearly. If there is still confusion I'll go to my other tech.


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Post subject: Re: Super 210 Optional Bias Mod
Posted: Wed Aug 26, 2015 2:04 am
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The bias mod you call it, may bring confusion if you just want a adjustable bias pot.

Any Fender schematic with a bias pot will show how to .


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Post subject: Re: Super 210 Optional Bias Mod
Posted: Thu Aug 27, 2015 10:52 am
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So I'm looking at a super 60 schematic in Aspen Pittman's Tube Amp book and the schematic calls it the "Optional bias mod".
It says to remove R158, a 10K resistor. Then stuff the empty parts on the board, R170 8.2K and R171, 5K linear pot.
Sounds easy.


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