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Old 28th September 2013, 12:56 AM   #1
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Default Low dcr choke in sse

I have a 29ohm Dcr choke that I intend to use in my SSE. I also have a 5W 100ohm resistor. Should I just wire these in series? Any other considerations?
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Old 1st October 2013, 02:59 PM   #2
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Old 1st October 2013, 03:51 PM   #3
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Why would you need the resistor as well?
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Old 1st October 2013, 05:22 PM   #4
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Quote:
Originally Posted by JonSnell Electronic View Post
Why would you need the resistor as well?
Is the DCR of the choke unimportant? Most of the information on chokes for this design that I've read have referenced an ideal DCR of 150ohms. Here's the schematic to the design in question:

Schematic | Tubelab

Edit: Seems the lower DCR may result in higher B+? Can anyone ballpark how much higher? I have 350V secondaries, a 5AR4 and intend to run KT88s.

Last edited by Sodacose; 1st October 2013 at 05:31 PM.
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Old 1st October 2013, 07:27 PM   #5
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Hmm, after playing around in PSUD2 (which I've never used before and it's awesome), it looks like there's a very small change in B+ (something on the order of 5V). That's if I'm using it correctly.

Anyone else with opinions on the DCR value of an L in a CLC?
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Old 1st October 2013, 10:27 PM   #6
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If the choke is in its correct position, after the valve rectifier, then what do you need the solid state diodes for? Extra voltage? (around 14v drop is in evidence from most valve rectifiers).
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Old 1st October 2013, 10:33 PM   #7
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The diodes are an option. Some builders install them so that they can compare amplifier performance with tube or solid state rectification.
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Old 3rd October 2013, 04:22 PM   #8
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Looking at PSUD2, it appears the biggest change is a higher current draw on the caps (max and mean). Voltages are slightly higher, but it's pretty mild. After thinking about it, this makes sense to me. I'm going to try it out and see how it goes.

Should I play with the fuse rating though? I was planning on using a 2amp fast-blow (as I've seen recommended). The max current spikes about 50% higher on C2 and L1 at startup with this 29ohm DCR choke than with the 150ohm recommended DCR.
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Old 4th October 2013, 03:41 PM   #9
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Just in case anyone else is ever wondering the same thing about their build, here's an update.

So I chickened out and used the 100ohm 5W resistor in series with my choke. Those calculated current draw numbers worried me a bit and I don't have an inrush limiter on the primaries (though there's one in the mail).

Amp works fine. Might have worked otherwise, but I feel a little more confident every time I flip the switch with that resistor in there.
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