Crucial TUBE question
I placed a KT 150 power tube into a Prima Luna Evo 300 preamp rectifier slot. I know. But what happened was surprising. The sound was, well, magnificent glorious. Nothing burned out. No smoke. No arc lights. I asked Upscale Audio to advise me as to what damage I may have done or could have done to the PL. They only said they would not advise placing anything but the original tubes in the slot. They would not commit to whether or not that power tube could be used in place of a rectifier to tube. So, is it an absolute or not? If so, why? I’d appreciate feedback (please, no slams) from anyone having any experience with this. Thanks!
@czarivey "Any tube ... can work as rectifier" I don't know one way or the other if that is factually correct, but I haven't come across any tube amps, DAC,s or preamps that use anything but a tube that is in fact specified as a rectifier tube as a rectifier. And, the manufacturers specify which rectifier is appropriate for the circuit and if there are options. For instance, my Modwright preamp specifies "5AR4, may also use 5U4GB and 5V4GB".
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@czarivey - Are you stating the use of any tube in a generic way , meaning if you were doing say a dyi build that you could design the circuit to accommodate any tube as a rectifier? Otherwise, I remain hard to convince that you can arbitrarily swap any tube as a rectifier into a manufacturers circuit that was designed with specific rectifiers in mind. In the Op's case apparently the folks at Upscale, whose owner has a long standing hands on relationship with Prima Luna ,didn't give the all's okay to swap in KT150s. I'm not being argumentative I'm just trying to better understand your position. |
