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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: VTL newby posted by rennie on August 18, 2002 at 02:03:27:
It sounds like you already know that 2 12AT7 is th correct tube complement; while you can sub the myriad 12AT7/ECC81 varieties, just because a tube has 9 pins and the same basing diagram (pinout-- pinX = plate etc) does NOT mean they can be interchanged for reducing gain. The VTL uses the studio-standard .75 volts in for full output; this is a LOT of gain-- a Heath W5 needs over 2 volts for full out... What exactly leads you to believe you have too much gain/volume? If you are trying to run a CD player straight in, you would indeed have far too much gain. Two solutions; get a resistor assortment from Radio Shanty and change the value of the input loading resistor; this is in essence what amps with gain controls do-- the potentiometer is an infinitely adjustable resistor to shave off input voltage. A linestage, buffered preamp is a better choice. BTW, that is a rarebird unit you have there; if it is indeed a 1983 piece, it is essentially a handbuilt amp with nice British iron.
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- Re: VTL newby - Chris Spafford 19:01:07 08/20/02 (0)
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