Not sure the 6L6 would be a good choice due to price, unless you have
some, or a good source. The price on them is astronomical. My guitar
amp uses 6 of them. I could purchase a nice, new amp for less than
replacing those tubes.
73
Roger (K8RI)
On 2/17/2015 5:14 PM, KA4INM wrote:
On 02/17/2015 03:11 PM, Paul KW7Y Baldock wrote:
I am building a 2x813 class C final modulated by 2x813.
The typical way to bias the class C final is with a combination of fixed
bias applied to the control grid and bias derived from the rf drive
through a grid resistor.
Rather than fixed bias applied to the grid it seems that I could achieve
the same effect by using a pseudo zener in series with the cathode,
similar to what is used in cathode driven linears.
Any thoughts on this approach?
I am guessing common cathode RF amplifier, a more standard way to do
it would be an adjustable bias supply and a clamp tube on the screen
grid. (6L6 or similar) look into any pre-1960 ARRL hand book.
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