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ever used KT88 for bass and el34 for mids/treble

I run two Prima Luna prolouge 4 amps as momo blocks in my set up. I built my own cross overs for each driver, so I can bi or even tri amp my speakers. I use channel one for bass and channel two for mids and trebble on each prolouge four. My question is what do you think would happen if I used KT88's for the bass and el34's for the mids and trebble. Maybe best of both worlds? Any ideas? The primaLuna amps have auto basis, so I can use any combo of tubes I want.
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zd542
5,339 posts
 
"I use channel one for bass and channel two for mids and trebble on each prolouge four.

That's not a mono block setup, its a vertical biamp. Are you planning to put el34's in one of the channels and KT88's in the other? Or put el34's in both channels of one amp and the 88's in the other, and switch over to a horizontal biamp?
mechans
3,048 posts
 
If you are really running separate amps not channels for the treble and mids on one and using another amp for the bass, then you can use different tubes. I think it should sound good or great. BTW how did you set up your crossovers?
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almarg
9,670 posts
 
I would interpret the question as referring to continuing to use the two amps in a vertical biamp configuration, but using EL34's in the channel of each amp which drives the mids/highs, and KT88's in the channel of each amp which drives the lows.

If so, a concern I would have is that the gains of the two channels would differ to a significant degree, resulting in a tonal imbalance. Unless, that is, the crossover network can somehow be adjusted to compensate. Or if you're lucky enough that using the 4 ohm tap on one channel and the 8 ohm tap on the other channel would happen to compensate sufficiently closely.

Regards,
-- Al
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