I find your in-depth power supply tests really interesting. Is there a specific reason for you to go with a modern SMPS vs. something like the HP/Agilent 6675A? There is a chance that those meet your requirements, I would think, and likely at a similar or maybe even slightly lower price (obsolete, so I refer to used units on ebay etc.). I've seen quite a number of used SMPS from TDK Lambda (also the rebranded versions from Agilent/Keysight) that might be worth looking at if it has to be a SMPS for weight/size/efficiency reasons. Regarding BK Precision: I got the impression that for some of their products they more or less rebrand asian products. At least there are astonishingly similar DC loads and LCR meters available from other companies... Not 100% sure though whether I'm right with my assumption though.
Yeah. I'm not sure either. The 9115B certainly performs much better than the $100 supplies, but it does have its drawbacks. I wasn't aware of the HP/Agilent 6675A. It also needs 240 V input... I ended up settling on a pair of 6654A. I think they'll work well.
@@Neurochrome2010 Just yesterday I’ve seen a 6654A for 200€ in perfect condition (which is almost half the average asking price in Germany), but I can’t justify to buy another (heavy) power supply. I might regret not buying it. If I remember correctly they use a preregulator of some sort (to be expected at this power level), but still achieve very low noise. A teardown/test would be appreciated 😅 Yeah, haven’t thought about the 240V issue. Here in Europe that shouldn’t be a problem I guess.
EUR 200 is a great deal ... if the supply works. And actually not a bad deal if it doesn't. The front panel encoders often take a beating but they're easy to replace (I have a video on that too). I think HP just brute-forced it. Large heat sink, large fan, etc. I don't think there's a pre-regulator. At least I don't recall one from the schematic in the service manual.
@@Neurochrome2010 Yep, you're right and that is a bit crazy. Up to >500W of power dissipation, I guess. At least in my 6642A they do not use different transformer taps. And It must have been the 667xA series PSU I was thinking about - these do have preregulators.
I find your in-depth power supply tests really interesting. Is there a specific reason for you to go with a modern SMPS vs. something like the HP/Agilent 6675A? There is a chance that those meet your requirements, I would think, and likely at a similar or maybe even slightly lower price (obsolete, so I refer to used units on ebay etc.).
I've seen quite a number of used SMPS from TDK Lambda (also the rebranded versions from Agilent/Keysight) that might be worth looking at if it has to be a SMPS for weight/size/efficiency reasons.
Regarding BK Precision: I got the impression that for some of their products they more or less rebrand asian products. At least there are astonishingly similar DC loads and LCR meters available from other companies... Not 100% sure though whether I'm right with my assumption though.
Yeah. I'm not sure either. The 9115B certainly performs much better than the $100 supplies, but it does have its drawbacks.
I wasn't aware of the HP/Agilent 6675A. It also needs 240 V input... I ended up settling on a pair of 6654A. I think they'll work well.
@@Neurochrome2010 Just yesterday I’ve seen a 6654A for 200€ in perfect condition (which is almost half the average asking price in Germany), but I can’t justify to buy another (heavy) power supply. I might regret not buying it. If I remember correctly they use a preregulator of some sort (to be expected at this power level), but still achieve very low noise. A teardown/test would be appreciated 😅
Yeah, haven’t thought about the 240V issue. Here in Europe that shouldn’t be a problem I guess.
EUR 200 is a great deal ... if the supply works. And actually not a bad deal if it doesn't. The front panel encoders often take a beating but they're easy to replace (I have a video on that too). I think HP just brute-forced it. Large heat sink, large fan, etc. I don't think there's a pre-regulator. At least I don't recall one from the schematic in the service manual.
@@Neurochrome2010 Yep, you're right and that is a bit crazy. Up to >500W of power dissipation, I guess. At least in my 6642A they do not use different transformer taps. And It must have been the 667xA series PSU I was thinking about - these do have preregulators.