avoiding inrush

[shooter]

if I keep OHM happy does this work?  30sec TD is tweakable
EDIT: trying to keep secondary from spiking, trying not to have to || caps, using 500vdc, unloaded is cal'd at 510vac

thanks

[PRR]

Depending on values of R, it may do almost nothing for that first cap.

Seems to me that more/fancier caps may be cheaper than a delayrelay and 50W resistor. Remember that non-electro motor caps in this range are coming down in price; there's a post I think in the Tools section.

[shooter]

thanks, I have some cheepeezz,  and it is a Mr Goldburgy circuit, it just seems like there should be a simplish way not to get such a large V spike waiting for slow analogs.
when the PT gets here I will experiment with the DL and see what's up.

I like 50 to 100uf at the 1st tap, but it takes 4 50's, or 4 100's to get there.   

[kagliostro]

Why use a delay relay

on old VOX there was a component called Brimistor (CZ 4 on the VOX AC50)

http://www.voxac50.org.uk/brimistor.htm

nowaday I think an NTC can be used as sostitute

--

In this old thread was discussed an alternative path to find a solution

http://el34world.com/Forum/index.php?topic=12395.msg115393#msg115393

EDIT: Here something that may be of your interest

http://el34world.com/Forum/index.php?topic=12801.msg119862#msg119862

http://www.electrojumble.org/DATA/STC_Brimistors_CZ_Types.pdf

http://www.electrojumble.org/data/stc_thermistors_gen_info.pdf

http://docs-europe.electrocomponents.com/webdocs/002a/0900766b8002a5a8.pdf

Franco

[shooter]

Thanks Franco, nice links

I like this;

Whether the brimistor really worked as intended is a moot point

Is that the part that needed the "oil pan" under it?  seems there was a thread sometime ago that did

[kagliostro]

I think I remember something about the "oil pan"

but to me seems that the involved component wasn't a Brimistor

EDIT: I just remembered ..... the component was the grid leak

http://el34world.com/Forum/index.php?topic=18218.msg185619#msg185619

Franco

[shooter]

you have a beautiful mind my friend

I was close, it's round

[trobbins]

Its a very long time to try and clamp B+ before indirectly heated output stage valves start to conduct sufficiently.  NTC/brimisters won't help as they only influence initial surge.

I used a shunt load for one amp to avoid the typically used delayed relay.  I had all the parts, although would've been nicer with a pcb.  I just didn't want to do series connected main filter caps, and as in your situation, the VAC to switch is really too high for most common relays meant for 240VAC as they get exposed to capacitor in-rush.

 https://www.dalmura.com.au/static/HV%20DC%20shunt%20load.pdf

[kagliostro]

Thanks Tim

Franco

[shooter]

thanks for the link, archived