mrkrausman
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Do stock Dual recs have 1 ohm 1 watt resistors installed between cathode and ground for bias measurement?
Dual Rec Bias Measurement
- Thread starter mrkrausman
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YellowJacket
Well-known member
mrkrausman said:
NO they don't. They have a fixed bias so you have to buy tubes that work within the bias of the amp!
mrkrausman
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YellowJacket said:
yes a fixed 'non adjustable' bias. But I'm not quite ready to let it go at that. i have read that these amps are set up with a cold bias current for headroom. Some say and i realize this is controversial that a bias pot in the right hands can be beneficial. 1 ohm 1 watt resistors at pins 1-8 to ground would allow for easier bias current reading. I am curious as to what that reading might be. It seems to me there is a window here to improve tone by adjusting the bias a little hotter. Just thinking.
fluff191
Well-known member
mrkrausman said:
Exactly. See the Bias Pot Install thread at the top of this section by the awesome Mikey383. I did the Bias mod and
it did worlds for my 3 Channel Recto. Warmed it up and rounded it out for sure. Plus, you can put any kind of tubes
you want in it (if so inclined).
mikey383
Well-known member
mrkrausman said:
You are correct about biasing them hotter. They are set up very cold from the factory, and having a bias pot installed does wonders for them. They can run very hot for a long time without component failures too....don't ask me how I know
They do not come with 1 ohm resistors since they are non-adjustable fixed bias amps, though it would be very simple to install them, and the prime time to do it would be when you're in there installing the bias pot. I bought them to install in mine, but changed my mind and bought a bias probe instead.
BTW, Fluff....someone needs to tell my wife that I'm awesome. She's just not convinced yet. :lol:
