Ali-Pacha
1000+ Head-Fier
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Ali
Ali
Given that there is no explanation such as "we're no longer able to process orders of this size" or "we are not offering this color anymore" I would be fairly certain the reasons are personal.
Question to the group about the power consumed/heat thrown off by the unit. I believe it consumes about 200W, how much of that (estimated probably) is from the power supply unit and from the amplifier? Given the heatsinks and probable circuit I'm guessing 20%/80% (PS/Amp), but if somebody with a unit could give me an estimate that would be helpful.
I'm looking at putting it into a cabinet and need to have an idea of the heat thrown off to know if this will work.
Having run valve pre-amplifiers and SET power amplifiers, I would strongly advice not to house any tube based amplifier in any kind of enclosure. The tubes dissipate a lot of heat, and the PS and circuits inside the BHSE the same. Any reduction of airflow of ambient room temperature will result in the amplifier overheating. Even if this did not kill the amplifier the amount of heat in an amplifier directly equates to component life.
Build a nice shelf unit with open air to your BHSE. It will be better. Ask Justin if not convinced....
Having run valve pre-amplifiers and SET power amplifiers, I would strongly advice not to house any tube based amplifier in any kind of enclosure.
Having designed and built valve pre-amplifiers, SET power amplifiers, and $1M scientific instrumentation at work I'm aware of dealing with heat. Thanks for the concern, seriously, but I know what I'm doing.
Interesting thing about heat. Colleague of mine said once, "all we're doing is making it smaller and use less power (and thereby produce less heat)". Lot of truth in that. I remember considering working for Intel once. Basically all they cared about is how much you knew about heat (or power dissipation and management specifically).
Ok that's good. If you know / are an expert, why ask the advice??????
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And incredulous as it may seem, if you still have some brightness left over, then get a free trial of the SR Red fuses and be prepared to be surprised.
I would say the surface of the BHSE power supply gets hotter overall than the surface of the main unit. Excluding the tubes themselves of course.
Difficult to guess what the percentage would be because the main unit has finned heat sinks whereas the PS uses the enclosure as its only heat sink, but my guess is the PS dissipates more than 20%.
I personally would not put the BHSE (or any Class A or Tube amp) inside a cabinet (assuming with closed sides). Nothing to do with calculations, just a vague feeling that the hotter you run anything above its intended normal working temperature, the more likely something will fail.
About 3 hours use so far, and using a coffee thermometer I read just under 120F on the main unit, and around 117F on the power supply. With the probe against the base of a tube, it reads 140F. Main unit is on top shelf of open rack, PS on bottom shelf