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Post subject: Super Twin Reverb
Posted: Wed May 31, 2017 3:40 pm
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A few questions regarding a Super Twin. Back of cabinet, Ground Switch A Off or B? What is Jack-Output Tubes Match? What is Jack-Hum Balance? More subjectively, any basic parameters on equalization and harmonic balance settings? Any help will be greatly appreciated!


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Post subject: Re: Super Twin Reverb
Posted: Fri Jun 02, 2017 1:35 am
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thomasjourney wrote:
A few questions regarding a Super Twin. Back of cabinet, Ground Switch A Off or B? What is Jack-Output Tubes Match? What is Jack-Hum Balance? More subjectively, any basic parameters on equalization and harmonic balance settings? Any help will be greatly appreciated!


Ground switch ; does'nt mater with a 3 prong cable and good grounded wall outlet today. You can safely switch to test.

Hum balance ; adjust to hear no hum in speaker , amp in play position. There is a screw head inside the hole, for flat screw driver. You can safely turn and test the hum.

Output tubes match; to balance tubes bias between each pair of 3 outputs tubes.
Like hum balance, there is a screw head inside ; don't turn if you don't know what you are doing



Schematic here ;

http://ampwares.com/schematics/super_tw ... b_180w.pdf


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Post subject: Re: Super Twin Reverb
Posted: Fri Jun 02, 2017 2:46 am
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stratele52 wrote:
thomasjourney wrote:
A few questions regarding a Super Twin. Back of cabinet, Ground Switch A Off or B? What is Jack-Output Tubes Match? What is Jack-Hum Balance? More subjectively, any basic parameters on equalization and harmonic balance settings? Any help will be greatly appreciated!


Ground switch ; does'nt mater with a 3 prong cable and good grounded wall outlet today. You can safely switch to test.

Hum balance ; adjust to hear no hum in speaker , amp in play position. There is a screw head inside the hole, for flat screw driver. You can safely turn and test the hum.

Output tubes match; to balance tubes bias between each pair of 3 outputs tubes.
Like hum balance, there is a screw head inside ; don't turn if you don't know what you are doing


+1

As well, it might not be a bad idea to pick up some spare 6C10 and 6XC8 tubes. These triple triodes are extremely rare and the supply is diminishing rapidly.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: Super Twin Reverb
Posted: Fri Jun 02, 2017 2:56 am
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+1 Arjay

+1000 for 6XC8 :lol:


6CX8 ; $5

https://www.tubedepot.com/products?utf8=✓&keywords=6cx8
6C10 ; $70 !!!!
http://www.thetubestore.com/Tubes/6C-Types/6C10

6C10 ; $100
https://www.tubedepot.com/products/6c10


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Post subject: Re: Super Twin Reverb
Posted: Fri Jun 02, 2017 7:50 am
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In most apps, the 12-pin 6BK11, 6BQ11 can substitute for the 6C10. All are compactron tubes. Mind you, rewiring from triple-triode to duo-triode is possible --- but requires major surgery. Including new sockets and punch outs, for those sockets.

My Ampeg Jet has two 6BK11. I bought a bunch of NOS ones, at the time (about 8 years ago) --- because I knew these tubes were getting harder to find, than just about any tube out there. At least, for guitar amp use.

Good luck!


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Post subject: Re: Super Twin Reverb
Posted: Sun Jun 04, 2017 8:02 am
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Thanx so much for the valuable info!


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