Standel 25L15-Do you like it as is or would you like to change something

[wsscott]

I'm working on the bias circuit in this cathode biased amp, and the schematic gives the option of making the cathode bias resistor adjustable using a 100 ohm pot plus a resistor vs. just a single value resistor.

This option calls for a 100 ohm pot plus a 68 ohm 2 Watt resistor.  I failed to order the 68 ohm 2 watt resistor, I just have 1/2 watts on hand.  But I do have a 100 ohm 2 watt resistor.  Would substituting this resistor create issues in adjusting the bias--or otherwise?

Thanks.

[sluckey]

Kinda hard to answer without access to a schematic.

[shooter]

But I do have a 100 ohm 2 watt resistor. 

more R = less I (I= E/R)
so you are "safer"
start WITHOUT the adjustability, get the basics dialed in, then tinker...so install the 100, figure out what the tubes are dissipating, figure out if they go into cut-off, figure out how it sounds......


then tinker

[wsscott]

Thanks Shooter-I figured there might be a math analysis involved that only some people would know.  Certainly not me!

[shooter]

 


it's not "math", it's the language of electronics