Papa's Pub ?
got me thinking of 'Bottles pop' 😀
well, post are gone, to picture thread
hope thats acceptable
http://www.diyaudio.com/forums/tubes-valves/71300-photo-gallery-383.html
got me thinking of 'Bottles pop' 😀
well, post are gone, to picture thread
hope thats acceptable
http://www.diyaudio.com/forums/tubes-valves/71300-photo-gallery-383.html
Actually, what I meant to say is a 10k or 15k to 600 Ohm transformer for plate load. Anyone familiar with James Transformers (local brand here in Taiwan). Sowter's look ok, but quite expensive.
Papa's Pub ?
got me thinking of 'Bottles pop' 😀
well, post are gone, to picture thread
hope thats acceptable
http://www.diyaudio.com/forums/tubes-valves/71300-photo-gallery-383.html
Sorry went to bed😴
Ill start a "tune QII-thread" when I'm there, thanks. Intention was chassie and mates to my 6V6-pre build but discussion went OT somehow sorry
/Staffan
James transformers are beautifully made, and very nice quality at an acceptable price, but probably not in the Hashimoto or Magnequest league.
(If you are on a very low budget, Daburu is usually even cheapter than James.)
All depends your personal taste, both are very good capacitors, FM strong with more mids & bass, Silmic II more refinated.
I had used 5R4GY & 5AR4 mostly for it, never had it with SS. So no experience of pros and cons with this pre.
Is never wrong, if you got the voltage and amps for 340 B+. Salas used caps tho.
/Staffan
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.
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.
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
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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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. 😀
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
Staffan
Thanks to all. It is funny how much pleasure i get out of figuring out something as simple as a 317 CCS regulator!
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)