Help with 300b proyect.

RAFG · 28th October 2006, 08:15 AM

A friend of mine who can build me a 300b SE amp has offered me his services.
I need a simple and good sounding design.

Is the Angela 91 amp a good design?

Is it better sounding than JE Labs 300b?

Are there better options than these considering simplicity/good sound
factors?

Thanks in advance,
Raul A. Fdez. Garrido
Xixon-Asturies (Spain)

arnoldc · 28th October 2006, 12:44 PM

Depends on what you prefer.

I find the Angela 91 too slow for my liking. So for me, the JE Labs 300B DX with the 76 in front to be better sounding.

There are so many options. I'm sure you'll have that dilemma.

ErikdeBest · 28th October 2006, 12:50 PM

Hi Raul

There have been at least two extensive threads on this issue, with exactly the same question and a myriad of answers, almost all different, by the way.

It is a drama, I admit. I am working on a reliable and technically good way to build amplifiers in a way that I can easily change tubes and circuitry, without having to start from scratch each time. It may take some time to complete it.

In the meanwhile I enjoy music from a commercial amplifier and a small headphone amp for late evening listening.

Erik

SunRa · 28th October 2006, 12:52 PM

Hello!

How about this one? Of course the powersuply is a little complicated, or better said expensive... but you could use your own design: Legacy

The one I like the most, and it's very well documented is this one:
Karna

This one is going to be expensive too, due to the use of interstage transformers. But you shoul get excelent results. I would not wory for the tubes... excepting the driver and the output tubes which come with a price, the ones in the powersuply are very cheap.

Good luck!

RAFG · 28th October 2006, 09:59 PM

I should also add, just in case there are some other piece of advice, that apart from simplicity/performance a non too extravagant budget is also appreciated.

Thanks Guys,

Raul

sgerus · 1st November 2006, 07:30 PM

I’m about 80% done building my 2nd amp, a 6sl7/300B

I decided to keep things as simple as possible. For what it worth, here are some details

6sl7 in SRPP at around 360V B++
300B 300V -61V 60ma, about 370V B+ (classic config right out of the WE datasheet)
AC heaters for both, with the 300B cathode Res and Cap right on the 5vac trans c.t.

This is a slightly simpler config that the one you mentioned.

This is a design that has been done commercially in the past (Wavelength Audio)

RAFG · 1st November 2006, 08:27 PM

Seems to be similar to the Ladyday kit sold by a diy company. Maybe a bit more conservatively driven. I've also been considering this kit.
Thanks for your advise.

28th October 2006, 08:15 AM	#1
RAFG diyAudio Member Join Date: Jun 2004 Location: Xixón-Asturies	Help with 300b proyect. A friend of mine who can build me a 300b SE amp has offered me his services. I need a simple and good sounding design. Is the Angela 91 amp a good design? Is it better sounding than JE Labs 300b? Are there better options than these considering simplicity/good sound factors? Thanks in advance, Raul A. Fdez. Garrido Xixon-Asturies (Spain)

28th October 2006, 09:59 PM	#5
RAFG diyAudio Member Join Date: Jun 2004 Location: Xixón-Asturies	Thanks, to all of you who contributed to this thread I should also add, just in case there are some other piece of advice, that apart from simplicity/performance a non too extravagant budget is also appreciated. Thanks Guys, Raul

1st November 2006, 08:27 PM	#7
RAFG diyAudio Member Join Date: Jun 2004 Location: Xixón-Asturies	Thanks, Sgerus Seems to be similar to the Ladyday kit sold by a diy company. Maybe a bit more conservatively driven. I've also been considering this kit. Thanks for your advise.

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28th October 2006, 12:44 PM	#2
arnoldc diyAudio Member Join Date: Apr 2003 Location: Makati	Depends on what you prefer. I find the Angela 91 too slow for my liking. So for me, the JE Labs 300B DX with the 76 in front to be better sounding. There are so many options. I'm sure you'll have that dilemma.

28th October 2006, 12:50 PM	#3
ErikdeBest diyAudio Member Join Date: Mar 2003 Location: Itoculo	Hi Raul There have been at least two extensive threads on this issue, with exactly the same question and a myriad of answers, almost all different, by the way. It is a drama, I admit. I am working on a reliable and technically good way to build amplifiers in a way that I can easily change tubes and circuitry, without having to start from scratch each time. It may take some time to complete it. In the meanwhile I enjoy music from a commercial amplifier and a small headphone amp for late evening listening. Erik

28th October 2006, 12:52 PM	#4
SunRa diyAudio Member Join Date: Aug 2004 Location: Romania	Hello! How about this one? Of course the powersuply is a little complicated, or better said expensive... but you could use your own design: Legacy The one I like the most, and it's very well documented is this one: Karna This one is going to be expensive too, due to the use of interstage transformers. But you shoul get excelent results. I would not wory for the tubes... excepting the driver and the output tubes which come with a price, the ones in the powersuply are very cheap. Good luck!

1st November 2006, 07:30 PM	#6
sgerus diyAudio Member Join Date: Nov 2005 Location: Milwaukee, WI	I’m about 80% done building my 2nd amp, a 6sl7/300B I decided to keep things as simple as possible. For what it worth, here are some details 6sl7 in SRPP at around 360V B++ 300B 300V -61V 60ma, about 370V B+ (classic config right out of the WE datasheet) AC heaters for both, with the 300B cathode Res and Cap right on the 5vac trans c.t. This is a slightly simpler config that the one you mentioned. This is a design that has been done commercially in the past (Wavelength Audio)

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