Valve Junior Head - 1W Mod

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grep
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Valve Junior Head - 1W Mod

Post by grep »

Hello!

Does anyone of you know how i can mod a 1W/1/4W Switch into my Valve Junior Head?
Goal is to cut the output power so I can enjoy that cranked tube sound in my bedroom.
I can't find schematics of a mod like this on the internet, thought maybe one of you knows something?

greetings,

grep.

btw I'm new here, cool forum, been browsing it for some time!
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Re: Valve Junior Head - 1W Mod

Post by long standing member »

go to this page:

http://www.sewatt.com/vj-mods

register as a member.

get dizzy from reading all about the different mods.
After Tuesday, even the calendar goes WTF!
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SenatorClayDavis
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Re: Valve Junior Head - 1W Mod

Post by SenatorClayDavis »

I wired an L-pad into my VJ to accomplish this feat. Very simple - just two resistors. You can also use a rheostat to make it variable, but I just have it as a switch.
grep
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Re: Valve Junior Head - 1W Mod

Post by grep »

SenatorClayDavis wrote:I wired an L-pad into my VJ to accomplish this feat. Very simple - just two resistors. You can also use a rheostat to make it variable, but I just have it as a switch.


Can you post a schematic of that please? hand-drawn, anything and maybe some values of the resistors?

thanks for the replies!
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SenatorClayDavis
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Re: Valve Junior Head - 1W Mod

Post by SenatorClayDavis »

I did this mod like 5 years ago, I don't remember the specifics of what I did. There used to be a good guide on Ted Weber's site but it's gone now.

Check out this site for an overview of the simple L-pad http://diy-fever.com/misc/l-pad/
and this one will tell you the effective wattage you'll get by the specific decible reduction http://www.diyaudioandvideo.com/Calculator/LPad/

So you run from your OT to a switch that allows you to select either straight to the speaker, or engaging the L-pad.
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