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Old 10th January 2012, 11:30 AM   #391
Salas is online now Salas  Greece
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Salas,
tube or solid state rectification? Recommendations or does it matter.
I had used 5R4GY & 5AR4 mostly for it, never had it with SS. So no experience of pros and cons with this pre.
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Old 10th January 2012, 11:33 AM   #392
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I had used 5R4GY & 5AR4 mostly for it, never had it with SS. So no experience of pros and cons with this pre.
Choke loaded?
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Old 10th January 2012, 11:36 AM   #393
stajo is offline stajo  Sweden
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Choke loaded?
Is never wrong, if you got the voltage and amps for 340 B+. Salas used caps tho.

/Staffan
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Old 10th January 2012, 11:40 AM   #394
Salas is online now Salas  Greece
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Choke loaded?
CLC it is.
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Old 11th January 2012, 01:01 PM   #395
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Salas,
I have orderd the last of the parts with a few exceptions. I have cohsen to go solid state on the B+ simplty because i don't have enough secondaires on my trafo, 2-300 and 2-6.3. The question i have concerns the LM317 regulator. I have never seen it wired this way an don't know the actual operating conditions. Since there are no voltage setting resitors, is the voltage equalt to that after rectification? Is the current set by the 5W resistors? I only have 6.3 V taps on my secondary. These seemed ok seince the thube datasheet showed 6.3V and 45mA for filament. You seem to have it running at higher specs if i am figuring correctly. Sorry for the basic question.
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Old 11th January 2012, 01:11 PM   #396
Zen Mod is offline Zen Mod  Serbia
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download datasheet of 317 and you'll see that's basic CCS arrangement

you need few volts more for headroom ( CCS needs few volts for proper operation)

can you add several turns of enameled wire , connected in series with existing filament winding ( toroid ? ) ?

I hope 45mA is typo ......... with one zero missing
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Old 11th January 2012, 01:17 PM   #397
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THanks ZenMaster. I took a quick glance at the formula at the top of the datasheet showing voltage regulation and went no further. RTFM applies here, I believe.
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Old 11th January 2012, 01:19 PM   #398
stajo is offline stajo  Sweden
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You could also serial the 2 secondarys. Connection between the two 300 would be your zero for tube rectifying.Serial the two 6,3 gives 12,6 wich is good headroom for the LMs

Staffan
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Old 11th January 2012, 01:30 PM   #399
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Thanks to all. It is funny how much pleasure i get out of figuring out something as simple as a 317 CCS regulator!
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Old 11th January 2012, 02:21 PM   #400
massimo is offline massimo  Italy
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Originally Posted by Zen Mod View Post
you need few volts more for headroom ( CCS needs few volts for proper operation)
Ok, but how many (roughly)? 2? 4? 6? or....

P.S. If I'm not wrong Coleman's Regs work more or les on the same principle (CCS)
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