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17 May 2008 21:37 | Quote
Joined: 12 Dec 2007
Karma: 1
Hi I want to know if someone here know about electronics in tube amps. Because I have the Epiphone Valve Junior and I want to make some upgrades to it. Thanks
18 May 2008 16:26 | Quote
Joined: 20 Aug 2007
United Kingdom
Karma: 1
what sort of upgrades?

like changing the tubes or what?

19 May 2008 07:10 | Quote
Joined: 12 Dec 2007
Karma: 1
changing the type of tubes used to get more output power like an old epiphone galaxy 10 that has the same circuit inside but with a different output tube that puts 10watts out.
19 May 2008 07:24 | Quote
Joined: 23 Dec 2007
United States
Lessons: 1
Karma: 45
go to google and type "modify Epiphone Valve Junior".
lots of information including a book.
19 May 2008 08:12 | Quote
Joined: 12 Dec 2007
Karma: 1
Thanks I have viewed this but the problem is that there is a modification to make it class AB push pull but need 2 EL84 or 2 6L6 and needs a phase inverter that is like making a new amp.
I was reading on the internet and find that the Epiphone Galaxy is 10watts and the circuit is almost indentical but with a EQ and Gain control and has a 6L6 in the output with the same output transformer of 5kohm in the primary. I think that if I change the tube socket to an octal and put the 6L6 and adjust the bias I can get 10 watts with the preamp section stock. Thanks
19 May 2008 09:13 | Quote
Joined: 13 Jan 2008
United States
Lessons: 8
Karma: 13
hold on buddy, you will also need to re-bios the amp for the tubes for the amp. also even a 10 watt amp has enough current running thru it to kill you so if your going to be poking around in there be careful.
19 May 2008 14:46 | Quote
Joined: 12 Dec 2007
Karma: 1
Thanks for remember that I will be careful because I dont want to die now LOL
I will be checking at a local tv repair shop that has old tubes to get other opinions on this mod an to check if they have the tube

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