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Old 4th November 2002, 02:33 AM   #1
richt is offline richt  Puerto Rico
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Question choke transformer question

salute folks

what is the best way to calculate values for a choke ?

i my design i have a 375vdc after the resitor.
c,r,c 385v+ resistor+ 375 on the out.

it feeds 3 6922 tubes.

i want to replace resistor with a choke.

thank you
richt
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Old 4th November 2002, 02:38 AM   #2
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richt,

Download this free software and design any supply you want. No spam and it is easy to use.

http://www.duncanamps.com/psud2/
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Old 4th November 2002, 02:49 AM   #3
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After reading your post it is easier than that. Whatever the value of the resistor make sure the choke has the same resistance. Hammond Manufacturing states the resistance of all of their chokes. It should also be rated at least at the current that the tubes are using or more, but no need to go more than 50% more. Beyond that get the most henries you can. If the choke is not high enough in resistance you can add enough regular resistance to bring it up. Actually I don't think additional resistance is needed as the circuit should work fine with 375 or 385 volts. The only problem would be if the choke resistance is greater than the resistor it replaces which is probably not the case.
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Old 4th November 2002, 03:01 AM   #4
richt is offline richt  Puerto Rico
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thanks

i am trying to download the program to see how it works.

i have the hammond choke tables but the selection is huge!

thanks
richt
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Old 4th November 2002, 03:27 AM   #5
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Tell me the value of your resistor and I can make a recomendation.
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Old 4th November 2002, 04:10 AM   #6
richt is offline richt  Puerto Rico
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thanks for your time !
i have in my homemade pre a 500 ohm resistor

for the reg. c,r,c.

total consuption is average 40ma.

thanks
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Old 4th November 2002, 04:45 AM   #7
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A 500 ohm resistor at 40ma. will drop 20 volts. Your circuit is only drawing 20ma. if it is dropping from 385 to 375 volts.
The Hammond 157G is 30hy at 40ma. 595 ohms. Should work well but your numbers seem a bit off. Look at it again. Let me know if your current draw is lower or the voltage drop is more than 10 V.
The 158L is 15hy at 75ma. and 411 ohms, another good pick.
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Old 4th November 2002, 05:10 AM   #8
richt is offline richt  Puerto Rico
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thanks again!!!!!!!!!!!!!!!!!!


i measured the ma & it is around 33ma (i am measuringwith
the resistor in series with the probes.

i bought this counterpoint pre on ebay & i like simples design.
i rip off the transistor regulator & installed a mosfet.
big improvment!

then i decided to try hexfred diodes & sounds awfull !

later i throw away the tiny power supply transformer
& installed a hammond & 5u4 tube rect and my head blew off !

silicone diodes for pre are not good! but are necesarly
for tube amps for transients.

thanks
for your time!
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Old 4th November 2002, 08:08 AM   #9
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could you post the schematic for the mosfet regulator? so on your opinion which is better for B+ tube regulator or diodes ? could u state the difference also
thanks
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Old 4th November 2002, 08:34 AM   #10
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Quote:
Originally posted by richt
later i throw away the tiny power supply transformer
& installed a hammond & 5u4 tube rect and my head blew off !
Being sceptical of this myself until I tried it, I am now an ardent convert. Try a choke input supply too for even better results.
Quote:
silicone diodes for pre are not good! but are necesarly
for tube amps for transients.
Silicon diodes are not good in the power supplies of any amps. The only bonus you get in a <i>properly designed</i> tube amp PSU by using silicon diodes, is a lot of switching hash. My power amp suffers no lack in dynamics and it is tube rectified CLC.
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