Has anyone auditioned the Balanced Audio Technology Rex II amplifier?
I think it is a Class A amp using 6C33C output tubes.
I think it is a Class A amp using 6C33C output tubes.
Has anyone auditioned the Balanced Audio Technology Rex II amplifier?
I think it is a Class A amp using 6C33C output tubes.
Has anyone auditioned the Balanced Audio Technology Rex II amplifier?
I think it is a Class A amp using 6C33C output tubes.
So it is push-pull?
The "all triode" and unique design of parallel banks of the phases is just marketing speak for push-pull?
No, BAT is a circlotron, see their FAQ:
Amplifiers
Is the REX II Power amplifier a single-ended amplifier design?
"
No, the REX II Power amplifier is neither a traditional single-ended design nor a push-pull design. We refer to the REX II, VK-255SE and VK-655SE amplifiers as single-ended bridge designs. This fundamental circuit dates back to the early 1950's and was invented by Henry Wiggins while working for the ElectroVoice Company. The original name for this type of output topology was Circlotron. The single-ended bridge design relies upon two single-ended amplifiers arranged in a floating bridge formation. This differentiates it from other forms of bridge topologies, most of which effectively incorporate two push-pull sides. The output circuit is inherently balanced and is driven differentially from a preceding stage. The two DC bias currents that exist in each half of the output stage cancel each other in the load. It is a more expensive way of building an amplifier as it requires multiple floating power supplies, as opposed to the more traditional ground-referenced supplies. The benefits of this approach, however, include enhanced symmetry when compared to push-pull designs and lack of the DC saturation problem inherent to single-ended designs."
I have no experience with REX or recent BAT equipment, but a few friends owned the older designs in the late 90's. At that time the distributor had a lot of problems because of the 6C33 quality - in part because the factory sourced tube sets were very expensive and people used cheap russian tubes.
So we can think about is an OTL style circuit design (two banks of parallel but out of phase tubes and then summed at the end) but with an output transformer?
C1 Ferrari had the VK 150 se with the atmasphere MP1 mk3 iirc. And bat rex pre
Thank you, gentlemen. I know what the BAT marketing literature says, but I do not understand it. It suggests to me a Class A, parallel push/pull design, using an output transformer. But I agree with Bill that if it were Class A the literature surely would make that clear.
I do not understand why the marketing literature describes the design as two SETs summed at the output with a transformer. Isn't that like an OTL Circlotron circuit but with an output transformer?
BAT VK-150SE monoblocks x 4 --> DALI MegaLine III. Still have all of these amps. I initially matched the 6H30P-DR input tubes,C1 Ferrari had the VK 150 se with the atmasphere MP1 mk3 iirc. And bat rex pre
BAT VK-150SE monoblocks x 4 --> DALI MegaLine III. Still have all of these amps. I initially matched the 6H30P-DR input tubes,
6SN7 drivers, and 6C33C output tubes using an Amplitrex AT1000. From the subset which passed the Amplitrex screen, I further
evaluated the tubes using a Tektronix 576 Curve Tracer. I maintained the same protocol for tubes which graced the BAT Rex, which
I have also kept.
Still have the Atma-Sphere MP-1 Mk. 3.2 preamp, though a Grace Design m905 splendidly serves the preamp function in my current rig.
Four A-S MA-1 Mk. 3.2 monoblocks drive the MegaLine, today.
Hi Davey,
The Atma-Sphere amps are a wonderful companion for the Dali. A-S amps x 4 yield quite a bit of heat as will the BAT's.
Heat is not so much a factor for me, however, as central A/C is available. SDG&E says I'm #1 in the neighborhood
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