Thanks. They look similar in output to the 6300 but that would need a new PCB :( Curious what the neon is for? Power indicator?
The 8200 is rated for 30ma - I measured 9ma on the prototype when it's running 4 tubes, 13ma for 6 tubes so it should be within limits. On Sunday, 15 February 2026 at 11:19:34 UTC Max DN wrote: > You must have acceded peak current and the mosfet is gone. If they are > both gone, no point repairing or replacing with same HVPS, it’ll happen > again. > > If interested, I have a much more powerful power supply for sale here: > High Voltage DC Power Supply Nixie Low Noise Audio Tubes 3.7-15V to > 100-230V <https://www.ebay.co.uk/itm/276921910331> > ebay.co.uk <https://www.ebay.co.uk/itm/276921910331> > <https://www.ebay.co.uk/itm/276921910331> > > > > On 15 Feb 2026, at 10:54, 'JBro63' via neonixie-l < > [email protected]> wrote: > > Hi all, looking for insight in to PSU problems. Have had two NCH8200s fail > very close together after only a few weeks of use. > > In December, I finally got round to building four IN-12 4 tube clocks > using a new PCB and some leftover tubes and drivers. They are driven using > a K155ID1 for each tube (no multiplexing) and MJE340 for the INS-1 colons. > Current limiting resistor is 18K. Each tube anode has a PC851 optocoupler > to turn the tube off if no presence is detected. > > My previous IN-12, IN-14 & IN-18 clocks use the 8200 or 6300 and are still > going strong. They are driven using HV5530s. > > Both 8200s have gone full short across the input. Anything about the > K155ID1 / PC851 that is harsher on a HV supply? Anything I can check for > with a scope? > > Thanks > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion, visit > https://groups.google.com/d/msgid/neonixie-l/a93fbd9d-36aa-4791-bffa-54f7d2514cdfn%40googlegroups.com > > <https://groups.google.com/d/msgid/neonixie-l/a93fbd9d-36aa-4791-bffa-54f7d2514cdfn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion, visit https://groups.google.com/d/msgid/neonixie-l/513d8a2a-cb3e-473e-a91f-45e6d50bb56cn%40googlegroups.com.
