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Old 18th May 2006, 09:06 AM   #221
poynton is offline poynton  United Kingdom
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Default Re: Re: Re: Re: Re: Re: This may work ........

Quote:
Originally posted by JeroenR



Yep, That's the one.

I used 47mF/160V caps as I was expecting 100V, not 150. Bit tight this way but at least it keeps the supply small. The red wire is the V-out. It is slightly boxed (alu) because it is close to outputs and the decoder/servo boards.

The decoder board is now empty where the opamps etc were. I hope to have just enough space for the tubes, caps and more caps...... and let's not forget the 6.3V supply.

Hi.

It may be necessary to add a regulator to ,say, 125V to reduce off load voltage and voltage droop in use.

Andy
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Old 18th May 2006, 09:49 AM   #222
JeroenR is offline JeroenR  Netherlands
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Default Re: Re: Re: Re: Re: Re: Re: This may work ........

Quote:
Originally posted by poynton



Hi.

It may be necessary to add a regulator to ,say, 125V to reduce off load voltage and voltage droop in use.

Andy

Why do you think that is necessary to add the regulator? Not enough head-room? I expect the tube circuit to draw about 1W (two time about 5mA at 100V) max.

Would someting like a 24reg and 100V zeners do the trick? But would that not require extra caps (space again)?
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Old 18th May 2006, 12:54 PM   #223
poynton is offline poynton  United Kingdom
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Default Re: Re: Re: Re: Re: Re: Re: Re: This may work ........

Quote:
Originally posted by JeroenR



Why do you think that is necessary to add the regulator? Not enough head-room? I expect the tube circuit to draw about 1W (two time about 5mA at 100V) max.

Would someting like a 24reg and 100V zeners do the trick? But would that not require extra caps (space again)?

Exactly what I had in mind. The extra caps do not need to be huge - 47uF again
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Old 18th May 2006, 01:20 PM   #224
JeroenR is offline JeroenR  Netherlands
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Default Re: Re: Re: Re: Re: Re: Re: Re: Re: This may work ........

Quote:
Originally posted by poynton



Exactly what I had in mind. The extra caps do not need to be huge - 47uF again

Could I put a dummy load on the supply to simulate the power consumption and so see what voltage drop I can expect before I install the reg? I expect the tube-circuit will draw somewhere between 5 and 10mA per channel so perhaps a 20Kohm/5W to see what happens? Or will this do bang again?

I'm asking because I'm afraid that if I set the output to high (150V) then there will be not enough "room" for the reg and when I set the output too low (at 100V) there will be too much dissipation in the reg.

So perhaps the question is : how do I find out what the best value for the zener is?

Thanks,

Jeroen
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Old 18th May 2006, 01:22 PM   #225
poynton is offline poynton  United Kingdom
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Try without the reg. to start.

It may be necessary to revise the power supply if too much hum.

Andy
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Old 18th May 2006, 01:42 PM   #226
JeroenR is offline JeroenR  Netherlands
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Quote:
Originally posted by poynton
Try without the reg. to start.

It may be necessary to revise the power supply if too much hum.

Andy

I certainly will try this weekend. After the supply there will be a resitor and one more cap directly connected to the plate of the top tube so perhaps if I take a good cap, add a choke somewhere.....

I'll get back again with diagram and photo's later.

Thanks,

Jeroen
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Old 18th May 2006, 08:54 PM   #227
JeroenR is offline JeroenR  Netherlands
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Here's the circuit I'm going to try.

Let me know if something looks odd.
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Old 21st May 2006, 10:56 AM   #228
JeroenR is offline JeroenR  Netherlands
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No tubes yet, just the 6.3V.
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Old 21st May 2006, 10:57 AM   #229
JeroenR is offline JeroenR  Netherlands
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Found a spot.....
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Old 21st May 2006, 10:58 AM   #230
JeroenR is offline JeroenR  Netherlands
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Deforrestation........ room for the tubes.
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