300B like 845 - Page 3

amperex · 19th September 2005, 03:29 AM

I built a pair of PP45 amps with a direct coupling pre to phase splitter and used a shunt regulated B+ power supply. The regulated B+ without having to be processed thru a series tube or transistor should be superior. The amp (monolocks) outperform a few well regarded 45 SET designs per new owner. With 100dB efficient speakers, it is not the higher power making the difference.

Brett · 19th September 2005, 03:32 AM

Quote:

Originally posted by amperex
and used a shunt regulated B+ power supply. The regulated B+ without having to be processed thru a series tube or transistor should be superior.

Agreed. Especially with a well designed CCS before the shuntreg.

rick57 · 19th September 2005, 05:51 AM

Thanks for the datasheet. I’ll over this week have have a trawl through all the many posts at Audio Asylum on this tube.
Though I didn’t know the volts are that high.

~ Space sure can cramp a diyer audio person, I suffer that too ~

Still not one 300B SE circuit good for dynamics/ rock (used with appropriate speakers)???

KYW? audiousername? Frank? analog sa? SY?

Cheers

rick57 · 19th September 2005, 06:25 AM

Tubelab

I like your tip of industrial control transformers. I now need to decide GM 70 (845/ 211??) and watts.

Cheers

Brett · 19th September 2005, 10:33 PM

rick57: see also this post

palmas · 4th October 2012, 09:19 AM

cheapest if you go for PP (or PPP) as the trannies are way cheapper than propr SE's.

you could go for GM70PP (big power) GU50 (in parallel can get about any power you'd like, specially in pentode).
I'd say first decide budget, then check trannies in good price, then decide.

I personally use a GM70 SE and get 45W and a lot of slamm. Never run out of power

19th September 2005, 03:29 AM	#21
amperex diyAudio Member Join Date: Feb 2005 Location: MI	Talking about good sound & design..... I built a pair of PP45 amps with a direct coupling pre to phase splitter and used a shunt regulated B+ power supply. The regulated B+ without having to be processed thru a series tube or transistor should be superior. The amp (monolocks) outperform a few well regarded 45 SET designs per new owner. With 100dB efficient speakers, it is not the higher power making the difference.

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19th September 2005, 05:51 AM	#23
rick57 diyAudio Member Join Date: Dec 2002 Location: dry ol Melbourne Australia	Thanks for the datasheet. I’ll over this week have have a trawl through all the many posts at Audio Asylum on this tube. Though I didn’t know the volts are that high. ~ Space sure can cramp a diyer audio person, I suffer that too ~ Still not one 300B SE circuit good for dynamics/ rock (used with appropriate speakers)??? KYW? audiousername? Frank? analog sa? SY? Cheers

19th September 2005, 06:25 AM	#24
rick57 diyAudio Member Join Date: Dec 2002 Location: dry ol Melbourne Australia	Tubelab I like your tip of industrial control transformers. I now need to decide GM 70 (845/ 211??) and watts. Cheers

19th September 2005, 10:33 PM	#25
Brett diyAudio Member Join Date: Jan 2002	rick57: see also this post

4th October 2012, 09:19 AM	#26
palmas diyAudio Member Join Date: Jun 2007	cheapest if you go for PP (or PPP) as the trannies are way cheapper than propr SE's. you could go for GM70PP (big power) GU50 (in parallel can get about any power you'd like, specially in pentode). I'd say first decide budget, then check trannies in good price, then decide. I personally use a GM70 SE and get 45W and a lot of slamm. Never run out of power