Home made SE 300B amp

JosM · 14th March 2008, 09:54 PM

Dear Audiofrinds,

Hereby a photo of my home made SE 300B amplifier.
Tubes are 76 (input) 46 (DHT driver) and of course the KR300B. Output transformer is from Sowter (UK)
The 76 and 46 are capacitor coupled and the 46 and 300B have an interstage (Tango NC20) If anyone is interested in the schematic I can send it to you.

sunrise · 13th July 2008, 08:32 PM

looks very nice.....expensive parts ....i hope it sounds nice.....the power transformer is made by??

kuroguy · 14th July 2008, 12:08 AM

NICE. Got another one of those or are you deaf in one ear and don't have any use for stereo?

Salectric · 14th July 2008, 05:14 PM

I am interested in seeing the schematic. Your tube selection is similar to one of the options I'm considering.

Please email to: eicotubes@hotmail.com

Thanks. Dave

bambadoo · 14th July 2008, 09:23 PM

Yes me to. Very interested in the schematic.

Sincerely

ombjerkvik@gmail.com

JosM · 16th July 2008, 07:13 PM

Hello sunrice,

The power transformer is also from Sowter England.

andyjevans · 16th July 2008, 10:00 PM

This is really the way to go. 300b is a great output, 46 is a great driver. I'd put a 26 or 01A in place of the 76 and a 10Y in place of the 46 but these are just flavours - the basic idea of 46 transformer coupled to 300b is exactly the way to do it.

Gain-wise, the 76 does push up the gain nicely. Subbing in a 10Y for a 46 raises the gain slightly, and you then lose a bit in the first stage with 26 or 01A. But basically you're just about there with fairly sensitive speakers, which you need for a 300b SET anyway. But that does include single drivers like the Jordan, which sound remarkably good.

Andy

G · 16th July 2008, 11:35 PM

Good stuff! Congrats.

Gavin

JosM · 24th July 2008, 08:33 PM

Hereby the schematic of my 300B amp

kmaier · 25th July 2008, 10:06 PM

Nice clean design, simple and direct. Only one comment: any particular reason you chose not to provide any static loading of the interstage driver (NC-20 secondary)?

Regards, KM

13th July 2008, 08:32 PM	#2
sunrise diyAudio Member Join Date: May 2005 Location: delta quadrant	looks very nice.....expensive parts ....i hope it sounds nice.....the power transformer is made by?? __________________ when you burn it - burn it good

16th July 2008, 07:13 PM	#6
JosM diyAudio Member Join Date: Feb 2008 Location: The Hague	300B amp Hello sunrice, The power transformer is also from Sowter England.

16th July 2008, 11:35 PM	#8
G diyAudio Member Join Date: Apr 2002 Location: Belleville, IL.	Good stuff! Congrats. Gavin __________________ Gavin

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14th July 2008, 12:08 AM	#3
kuroguy diyAudio Member Join Date: Sep 2007	NICE. Got another one of those or are you deaf in one ear and don't have any use for stereo?

14th July 2008, 05:14 PM	#4
Salectric diyAudio Member Join Date: Apr 2005 Location: Maryland	I am interested in seeing the schematic. Your tube selection is similar to one of the options I'm considering. Please email to: eicotubes@hotmail.com Thanks. Dave

14th July 2008, 09:23 PM	#5
bambadoo diyAudio Member Join Date: Feb 2003 Location: West Coast of Norway	Yes me to. Very interested in the schematic. Sincerely ombjerkvik@gmail.com

16th July 2008, 10:00 PM	#7
andyjevans diyAudio Member Join Date: Sep 2003 Location: London	This is really the way to go. 300b is a great output, 46 is a great driver. I'd put a 26 or 01A in place of the 76 and a 10Y in place of the 46 but these are just flavours - the basic idea of 46 transformer coupled to 300b is exactly the way to do it. Gain-wise, the 76 does push up the gain nicely. Subbing in a 10Y for a 46 raises the gain slightly, and you then lose a bit in the first stage with 26 or 01A. But basically you're just about there with fairly sensitive speakers, which you need for a 300b SET anyway. But that does include single drivers like the Jordan, which sound remarkably good. Andy

25th July 2008, 10:06 PM	#10
kmaier diyAudio Member Join Date: Jul 2007	Nice clean design, simple and direct. Only one comment: any particular reason you chose not to provide any static loading of the interstage driver (NC-20 secondary)? Regards, KM

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