Yes, it's wire-wound and good for several watts. Very handy. I made myself another box, briefly shown in the video in the remote control section, with 4 (normal) pots, also useful.
Nice repair of an interesting piece of equipment. Another use would be as an AC "amplifier" to produce various AC frequencies and voltages for testing. I often hear people refer to SCRs as thyristors - which is correct. However thyristor refers to a group of PNPN components that includes DIACs, SIDACs, IGCTs, ASCRs, SCRs and TRIACs so should not be used when talking about a specific component. Your usage of SCR is correct in this case. Regards, David
Thanks for the update on SCRs. Using the remote voltage capability for an AC amp crossed my mind but this is a DC power supply, so at best it can produce "positive" AC. I might play around using a big cap to block the DC component but not sure how useful that might be. I did get myself a HP 267A power supply/amp that is meant for this kind of thing up to 1MHz no less, but I bought it as "not working" and indeed it is not. Another repair (hopefully)
@@TheHWcave I am not familiar with the HP 627A but I do own an HP 6826A Power Supply/ Amplifier. I purchased it a while back on eBay as "not working". The only thing that I found was the "programming" jumpers were not correctly connected for normal operation! The only other issue I found was darkening of the PCB under R5 and R6 on the power supply PCB. I replaced the resistors, leaving the leads long to seperate them from the PCB. Great piece of equipment and very handy to have on the bench. Looking forward to seeing a repair video on your unit. Regards, David
Those old capacitors generally had some headroom built in over the working voltage "surge voltage" I think was the term. Not uncommon to see them run near the limit, just how things were done at the time.
No, they all tested fine, including the sticky ones and the big one. In general, I am now more picky in replacing caps. Vintage ones seem to last much longer than normal. Yes they may fail eventually but even new ones may do that. I think these days caps have evolved to higher performance in smaller form factors which may not be the best for a long life.
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I like that big variable resistor setup you have there. Good to have and more useful than a decade box in some cases.
Yes, it's wire-wound and good for several watts. Very handy. I made myself another box, briefly shown in the video in the remote control section, with 4 (normal) pots, also useful.
Nice repair of an interesting piece of equipment. Another use would be as an AC "amplifier" to produce various AC frequencies and voltages for testing. I often hear people refer to SCRs as thyristors - which is correct. However thyristor refers to a group of PNPN components that includes DIACs, SIDACs, IGCTs, ASCRs, SCRs and TRIACs so should not be used when talking about a specific component. Your usage of SCR is correct in this case. Regards, David
Thanks for the update on SCRs. Using the remote voltage capability for an AC amp crossed my mind but this is a DC power supply, so at best it can produce "positive" AC. I might play around using a big cap to block the DC component but not sure how useful that might be. I did get myself a HP 267A power supply/amp that is meant for this kind of thing up to 1MHz no less, but I bought it as "not working" and indeed it is not. Another repair (hopefully)
@@TheHWcave I am not familiar with the HP 627A but I do own an HP 6826A Power Supply/ Amplifier. I purchased it a while back on eBay as "not working". The only thing that I found was the "programming" jumpers were not correctly connected for normal operation! The only other issue I found was darkening of the PCB under R5 and R6 on the power supply PCB. I replaced the resistors, leaving the leads long to seperate them from the PCB. Great piece of equipment and very handy to have on the bench. Looking forward to seeing a repair video on your unit. Regards, David
Those old capacitors generally had some headroom built in over the working voltage "surge voltage" I think was the term. Not uncommon to see them run near the limit, just how things were done at the time.
Yes, I agree and it was running for more than 50 years... , well intermittently but still.
Excellent.
Hi, did a video of testing the removed Solartron caps ever happen?
No, they all tested fine, including the sticky ones and the big one. In general, I am now more picky in replacing caps. Vintage ones seem to last much longer than normal. Yes they may fail eventually but even new ones may do that. I think these days caps have evolved to higher performance in smaller form factors which may not be the best for a long life.