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Old 19th March 2011, 02:32 AM   #1
grungeman91 is offline grungeman91
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Join Date: Aug 2010
Default Advice Needed

I'm trying to make a Williamson amp with 6l6GC tubes in the output stage. I'm trying to calculate the resistor values but I'm having trouble with the calculations. How can I go about analyzing the original amplifier so I can appropriately choose my resistors. I have this website to see the original design and I have the 6L6 datasheet. I plan to run in push-pull AB1 for 25 watts of output power.


I would like this blog to be for advice only. I have been here several times asking for advice and half of the posts end up being people debating things rather than giving me advice. I need help.
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Old 19th March 2011, 12:02 PM   #2
DF96 is online now DF96  England
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Join Date: May 2007
"trouble with the calculations" is a bit vague. I assume you know about load lines, cathode bias, and understand what the datasheet is telling you? E.g. you know about gm, amplification factor and anode/plate impedance? You can calculate the gain of a triode stage, or estimate it from the graphs in the datasheet? If not, you need to do a lot of reading.
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Old 19th March 2011, 09:26 PM   #3
payitforwardeddie is offline payitforwardeddie  United Kingdom
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Join Date: Feb 2011
Location: South Wales, UK
I do a lot of reading.
I'm none the wiser.

I'm currently building two Mullard 5-20s and to get the extra watts (25-30) all I am doing is replacing the cathode resistors for the output valves with 10 ohm ww (for current measuring purposes) and negative bias for the grids. Maybe you could do the same. I think the design of the speakers will affect the amp more than mathematics.

Last edited by payitforwardeddie; 19th March 2011 at 09:34 PM.
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