In Reply to: Re: Hum pot in DHT preamp ??? posted by dave slagle on November 1, 2001 at 07:26:34:
Hi!> did you ever consider connecting the bias resistor to the positive > side... this will buy you some extra bias
> voltage, and allow for a slightly smaller resistor for the sameI'm not sure if I understand what you mean by this,
but with the filament bias approach this wouldn't work.
With filament bias, the filament itself is actually a
substantial part of the bias resistor.
> i assume since you are using it, you like the sonic results of > the bias resistor :-)Im my 801 linestage the bias resistor is only 33 Ohms.
I still use the ultrapath connection. The B+ side of
the lineout transformer is returned to the - side of
the filament. So the AC signal actually bypasses the
bias resistor (at least from the midrange on upwards)Thomas
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Follow Ups
- Re: Hum pot in DHT preamp ??? - Thomas Mayer 07:45:25 11/01/01 (10)
- Re: Hum pot in DHT preamp ??? - dave slagle 09:35:52 11/01/01 (9)
- Re: Hum pot in DHT preamp ??? - Thomas Mayer 09:49:48 11/01/01 (8)
- Re: Hum pot in DHT preamp ??? - dave slagle 14:09:25 11/01/01 (7)
- Re: Hum pot in DHT preamp ??? - Thomas Mayer 17:25:18 11/01/01 (6)
- Re: Hum pot in DHT preamp ??? - dave slagle 08:44:35 11/02/01 (5)
- Re: Hum pot in DHT preamp ??? - Thomas Mayer 12:24:45 11/03/01 (1)
- Re: Hum pot in DHT preamp ??? - dave slagle 07:37:03 11/06/01 (0)
- Re: Hum pot in DHT preamp ??? - larry moore 10:03:58 11/02/01 (2)
- Re: Hum pot in DHT preamp ??? - Thomas Mayer 12:21:44 11/03/01 (1)
- Inspiration - J Epstein 13:09:24 11/03/01 (0)