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In Reply to: running 2 mono tube amps in parallel to one speaker posted by m8o on March 25, 2007 at 01:13:38:
Several tube amps of conventional output design allow paralleling. The Dynaco Stereo 70 has built in provision for paralleling the channels and so do several McIntosh stereo power amps.The advantage to paralleling in tube amps is that the Damping Factor is doubled (actually, the source impedance is halved) so the amp speaker interactions are reduced. Power is doubled, but the impedance tap values are halved.
The criteria for paralleling seems to be stability. I'm guessing, but I think some amps would go into oscillations if paralleled.
The Gain Clone is a bit of an exception for SS amps. Most SS amps will not tolerate paralleling. For SS amps, the common thing is "bridging" which requires that the two amps be driven out of phase with each other. DF is halved. Also, the ability to drive low impedance loads is compromised as each amp sees 1/2 the load impedance.
If the two channels share a common, bi-polar power supply, bridging is easier on the supply than paralleling.
Bridging requires that the common terminal of the outputs be at ground potential.
Jerry
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Follow Ups
- Re: running 2 mono tube amps in parallel to one speaker - Bold Eagle 10:43:15 03/25/07 (1)
- Re: running 2 mono tube amps in parallel to one speaker - m8o 19:17:39 03/26/07 (0)
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