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Old 16th December 2007, 04:33 PM   #1
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Default 12ay7 Circuit

hello and sorry to bother you but if you can please help me

i have absolutely no expirience on working with tubes
i have about 20 12ay7 tubes from the police I bought them from scrap all of them sealed brand new together with some other exotic tubes and i was thinking that i could make a line tone control preamplifier with them to use with my cd and power amp ....

i found fender schematic i can read that but dont know if line levels are switable to this circuit and also of course i can construct proper power sup for all these but i dont even know the numbering on the pins of the tube !!!

as i said i dont have a ny knowledge about tubes how can i tell on the schematic which pin is which and also nowere is any note about filaments ....is this taken for granded ???

please help me out

find att. of the fender schematic and if you have something that meets my specs please give me

thank you
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Old 16th December 2007, 04:45 PM   #2
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Default Re: 12ay7 Circuit

Quote:
Originally posted by sakis
i have about 20 12ay7 tubes from the police
I won't ask!

Seriously though, the 12AY7 can be one of the nicest sounding Novals, so lucky you! What brand are they?

Quote:
Originally posted by sakis
i found fender schematic i can read that but dont know if line levels are switable to this circuit and also of course i can construct proper power sup for all these but i dont even know the numbering on the pins of the tube !!!
This page should help you out for that.

Hopefully someone else can suggest some other circuits for you too.

Please read the "Tube Safety" thread which you can find on the first page of this forum.
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Old 16th December 2007, 06:52 PM   #3
neazoi is offline neazoi  Greece
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hello sakis I am from Greece too.
I have no experience in the 12ay7 tubes but it seems to me better than the 12ax7.
Forget about your circuit posted here if you want good performance.
If you go for triodes, go for single ended topology (true class-A).
Find the datasheet here:
http://www.mif.pg.gda.pl/homepages/f...49/1/12AY7.pdf
it has a quite good amplification factor of 40.
To ensure transparency I would use one single 12ay7 for both channels (i.e. one stage only). Then If I needed more gain I would add another identical stage in series.
Check out my page of a similar design that I have designed.
http://www.neazoi.com/page/audio/pc88/pc88.htm
more of my audio projects can be found here.
http://www.neazoi.com/page/audio
and the main site is here.
http://www.neazoi.com/

By the way what other tubes exotic have you got?
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Old 16th December 2007, 07:24 PM   #4
Trout is offline Trout  United States
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If you decide your not wanting them, I am always hunting for those for vintage Fender guitar amp projects.

Fresh ones are getting a bit tough to locate at a fair price. EH makes a current production version, but IMO they are a bit brittle compared to NOS GE or RCA's.

The last bunch I got from EH turned microphonic in about 20 hours of use, though this is in a fairly high gain enviroment.

Trout
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Old 17th December 2007, 07:44 AM   #5
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Default ok guys ......

really thanks a lot .....

i will actually take a look in all these and let you know

all the tubes i have are jan and also made of motorola so i trust that they are perfect quality

trout
.... no problems i have plenty make a simple circuit for a tone control preamplifier for me ( since i have no design skills AND ALSO DONT WANT TO MESS UP IN ANYTHING TO COMPLÉCATED )
and you will find some 12ay7 in your xmas mail box ha ha ha

neazoi

thanks for your interest yet i havent checked your links but as i mentioned above i dont want anything too extreme or too complicated

after all i am a transistor person and i only doing this cause i have the tubes it may sounds perfect but i cannot construct things that will last less than 100 years ( he he he )
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Old 17th December 2007, 07:59 AM   #6
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Default O GOD !!!!!

come on guys !!!! all these information i cannot use .......

tdsl data i ve seen before but dont know what to do with them what i am asking for is a complete schematic with voltage and pin layout

having a pdf link about the complete data of the lamp is something i cannot use !!!!!!!!!!!!!

dont know how

only thing i asked is a circuit for one input for a cd player ,tone control bass and treble and out enough to drive one amplifier with 1+ volts input

thats it !!!!!
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Old 17th December 2007, 09:43 AM   #7
7N7 is offline 7N7  United Kingdom
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12ay7 is not suitable for this application. Too much gain and very little drive ability.

For your application a 12B4 is probably the best choice.

A CD player has output< 2v rms and your amplifier has sensitivity of 1v.

7N7
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Old 17th December 2007, 10:02 AM   #8
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Default excuse me

but i said that i dont have ahinch about tubes so what i say may be not right

fender uses this tube for tone control circuit ..... and yes you are correct cd out is about 2vso any circuit with gain 1 will do the trick ......

if input is about 2v and the loos from tone control doesnt make it less than 1v in the out i am more or less ok i think
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Old 17th December 2007, 10:53 AM   #9
7N7 is offline 7N7  United Kingdom
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Default Re: excuse me

Quote:
Originally posted by sakis
but i said that i dont have ahinch about tubes so what i say may be not right

fender uses this tube for tone control circuit ..... and yes you are correct cd out is about 2vso any circuit with gain 1 will do the trick ......

if input is about 2v and the loos from tone control doesnt make it less than 1v in the out i am more or less ok i think
A Fender guitar amplifier is designed to have a sensitivity of probably <100mv, a far cry from a CD player...

Search here, there are plenty of circuits for 12B4 line stages

7N7
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Old 17th December 2007, 12:00 PM   #10
SY is offline SY  United States
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Quote:
tdsl data i ve seen before but dont know what to do with them what i am asking for is a complete schematic with voltage and pin layout
So what you're asking is, "Can somebody else do a complete custom preamp design for me, including full documentation and checkout? For free?"

Good luck!
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