
Kapo_Polenton
Well-known member
Comparing this to my Randall Lynchbox that runs EL34's, I don't know what it is about this 800 but it really fights me. Even with a pedal I find it not very yielding. Is this a 6550 vs. EL34 feel thing? I tried a couple non evasive mods tonight:
2. Locate the 10K cathode resistor (R6 found on V1B) and replace it with a 4.7K resistor. This will beef up the gain. This seems to be the "sweet-spot" on these amps. If you want insane gain use a 1.5K.
and
3. Locate the 820ohm cathode resistor (R9 found on V2A) and place a .68uf cap across it. This will increase the gain a little. But mostly it gives you the nice "Plexi" midrange boost.
Not too convinced with #2 and #3 I like the voicing of but am thinking the last thing I need is any more mid range cut when the amp is not very yielding. I'll prob just stick with stock so as not to butcher this thing but as is, I am not really in love with it. So here are a few questions, 6550's cost way more than EL34's. Is it worth getting a new pair of these or should I just make the required changes to the amp so I can run KT77's and EL34's? Or do I just have one of the amps that has iron which lends itself to this particular sound?
2. Locate the 10K cathode resistor (R6 found on V1B) and replace it with a 4.7K resistor. This will beef up the gain. This seems to be the "sweet-spot" on these amps. If you want insane gain use a 1.5K.
and
3. Locate the 820ohm cathode resistor (R9 found on V2A) and place a .68uf cap across it. This will increase the gain a little. But mostly it gives you the nice "Plexi" midrange boost.
Not too convinced with #2 and #3 I like the voicing of but am thinking the last thing I need is any more mid range cut when the amp is not very yielding. I'll prob just stick with stock so as not to butcher this thing but as is, I am not really in love with it. So here are a few questions, 6550's cost way more than EL34's. Is it worth getting a new pair of these or should I just make the required changes to the amp so I can run KT77's and EL34's? Or do I just have one of the amps that has iron which lends itself to this particular sound?