Roosterrooster wrote:250 would be louder and tighter. The thing to be aware of is that various power tubes have an screen/plate relationship that effects their behavior. With some tubes (6L6 by design) you can hit this soft spot by going up in value, say 2K, or likewise having no choke at all. Take a look at the tweed 5E5-A Super for a learning experience. A very soft amp that actually has more voltage on the screens than the plates.
Thanks
I did not have a 250 R so I paralleled another 1K with the existing one - making roughly 500R.
The screen resistors were pretty large too- a leftover from a previous build in this chassis
I replaced them with 150 R, 5 Watters.
There is a definite tightening up now. Haven't had a chance to crank her but it sounds promising.
I have a sense the amp feels a bit punchier in the highs too
This reminds me that I once built a Traynor YGM2 clone and the resistor value in that position was ridiculously low. Something like 20 ohm
For a 18 watt amp that thing was ungodly loud. It had headroom up the Ying-Yang and when it broke up it was very aggressive
Thanks again!
Markus