Just to clarify, are you adjusting the bias after you change the tube types each time?
My Cayin came with used 6550’s. I switched to new KT88’s, preferred them right away and after broken in. Wonderful sounding tube amp.
I did not change the bias. I just now had the bias adjusted properly by VAS. While waiting, I used my tube amps with EL34’s, got out test tracks, refined my speakers L-Pads this way and that, love the EL-34’s sound as much as the Cayin.
Now, Cayin ’properly’ biased, I like the sound a bit less.
Using the Cayin, I’m going to re-refine my speaker’s L-Pads with a newly purchased sound meter, test tracks, and familiar music. Then? If not thrilled, unplugged, I can note where Steve put them, and I can put them back where I had them, right in the middle of the adjuster’s range!
If the sound changes, I will be a big proponent of adjusting bias for sound rather than tube life.
My Cayin came with used 6550’s. I switched to new KT88’s, preferred them right away and after broken in. Wonderful sounding tube amp.
I did not change the bias. I just now had the bias adjusted properly by VAS. While waiting, I used my tube amps with EL34’s, got out test tracks, refined my speakers L-Pads this way and that, love the EL-34’s sound as much as the Cayin.
Now, Cayin ’properly’ biased, I like the sound a bit less.
Using the Cayin, I’m going to re-refine my speaker’s L-Pads with a newly purchased sound meter, test tracks, and familiar music. Then? If not thrilled, unplugged, I can note where Steve put them, and I can put them back where I had them, right in the middle of the adjuster’s range!
If the sound changes, I will be a big proponent of adjusting bias for sound rather than tube life.