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Old 11th January 2008, 09:34 PM   #81
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Not hundred % sure that this one is not already here. A page that link to some very good readings: Miscellaneous Document Archive

Among the links on this page, my favorite of the day, a must read: Beam Power Tubes by O.H. Shade
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Old 17th February 2008, 07:00 AM   #82
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great info! Thanks guys!
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Old 1st March 2008, 10:26 PM   #83
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I am a newbie to tubes and have always been interested in these glass thingies that I keep finding but I just put them in my bits box thinking"I must read up about these devices someday".
Only recently did I discover this forum and have built a surround chipamp but tonight I found this thread and more specifically,BHD's link to boozhoundslabs amplifier and some other theory links.
Boozhounds amp is a beutiful piece of craftsmanship and I have just got to make one,so I will be posting here a lot soon with silly questions.
This forum is great.
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Old 9th May 2008, 07:16 AM   #84
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Hey dudes. I am going to make a tube preamp and also a guitar amp. I need to be unmoderated! Unmoderate me! Unmoderate me now! Will that do it?
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Old 12th June 2008, 01:39 PM   #85
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hey guys,
thank u so much,
your jobs are very helpful to me!
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Old 22nd July 2008, 09:36 PM   #86
pstcho is offline pstcho  Greece
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Default replace 12au7 by 12ax7

hi, is that possible to replace a 12au7 by a 12ax7 in tube preamp

what kind of mods must i do to do it?

excuse me if the question has been posted many times

thank you
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Old 24th July 2008, 12:50 PM   #87
impsick is offline impsick  United States
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WOW found this page just. Great stuff. The tube numbering system link is some good info to know! HERE
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Old 30th July 2008, 06:52 AM   #88
msmpe is offline msmpe  United States
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Default Re: replace 12au7 by 12ax7

Originally posted by pstcho
"is that possible to replace a 12au7 by a 12ax7 in tube preamp"

I'm not the expert, but if you go to Tube Town and look up their report on preamp tubes, they suggest swapping a 12Au7 with a 12ax7 for more gain (40 vs 100). Also, Steve at Decware makes the same suggestion for one of his amps. Check out the three tubes in your tube manual.

Also aNooby hooked on tubes
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Old 30th July 2008, 12:39 PM   #89
pstcho is offline pstcho  Greece
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hi, thank you for your answer

it's the same connection but somebody in another forum told there's too mutch modify to make to have no trouble with noise because of impedance difference

somebody as already done it for a test?

thank you
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Old 6th August 2008, 01:36 PM   #90
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Default New To Tube Testing

Hi, Great site here LOADED with info! My name is Stan & I'm from New York. I have a question on my B & K Dyna-Quik Model 650 & would be beyond grateful if someone could help me. I have a hundred + 6550 International KT-88 tubes and cannot figure out if my B & K has the socket for proper testing. Based on my built in chart that # falls in between two others with completely different sockets,sensitivity #'s & heater#'s. I am new to this end but not new to using tubes. Thanks & great site! Awesome info- I feel like I found a new home! If I need a new tester please let me know the best and most affordable recommendation. 6550stan
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