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Old 13th January 2003, 03:44 PM   #11
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John,

Everywhere I read people says the proac works best with SET,
although I'm not sure of the general sound differnce with PP.

I'm not sure what kind of 300B i listened to with the proacs (SET or PP), but the dealer said it was 30W of 300B (they use western electrics) and I just loved the sound. I then later on spoke to an tube amplifier constructor in Sweden (Erik Andersson that works for Audion) and he said "no way the tube amplifier you listened to can give 30W with 300B, maximum 18-20W" so I assume that is the correct figure.

So if 9W in SET is realistic (I think Audion uses 2x300B/channel SET to get 18W, but that design is maybe to difficult for DIY?),
I can go for that. Either buy a kit or assemble the components myself.

perka
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Old 13th January 2003, 03:48 PM   #12
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Quote:
Originally posted by dhaen
Hi Perka,

I forgot. You could use PSE 300B's. (Parallel Single Ended).
Parallel topology is frowned upon by some, and approved by others.
Personaly I have an open mind at present.

Theroetically it should sound most like SE. But some people say that it sounds "blurred" by comparison. There are not convincing technical arguments either way.

Cheers,
Yes, I think Audion developed their new monoblocks with parallel 300B and they get 18W/channel. http://www.audion.co.uk/html/silver_night_.html
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Old 13th January 2003, 03:48 PM   #13
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Hi perka,

Here are a few observations I have made on deciding what to do. on building an amp. It's not a perfect list.

1. Building From A Kit:

All parts are supplied by manufacturer. Usually the instructions are very thorough and thought out. There seems to always be a message board on the web dedicated to that design offering lots of help. You learn a lot and satisfaction is high. Initial cost can be expensive for some high end kits. Only dark side, a lot of people will have the same amp.


2. Building From Scratch:

First, the dark side,
There usually is only a schematic, you must choose one and then stick with it or design your own. You must source all your parts. You must determine your own layout for parts and build or buy a box to hold it all. Cut the box (metal working or wood working tools required or pay some one to do it). Ask a ton of question on a message board.

Second, the light side.
Buy things as you need them, can maintain a budget.
You build a one of a kind, You learn a lot more. The satisfaction is certainly as good, if not better, than building from a kit.

3. Repairing an old Amplifier:

Usually everything is there. Schematics are easy to obtain, A lot of web help available. Could be a lot of work and you are fixed to that design.

I just finished my first ever build, a set of monoblocks based on the design of the JE Labs 300b. The members here are very very helpfull.

Here is a link to my finished, (work in progress), amp/s.

http://www.diyvideo.com/forums/showt...&threadid=9442
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Old 13th January 2003, 03:58 PM   #14
dhaen is offline dhaen  Europe
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Hi Perka,

I looked at the site. Yes they're claiming 18watts from PSE, or 25watts from PP. That sounds believable.

Do remember that some manufacturers quote prices without tubes.
The WE tubes you mentioned would use up all your budget. But you can buy other brands for the figures Frank mentioned.

IMO A PP amplifier sounds closer to a Solid State amp. An SET will sound "warmer".

Cheers,
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Old 13th January 2003, 04:02 PM   #15
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Perka,

I am going to blow my own horn here:

First though, how much do you want to spend?

I have a 300B kit for $749 including all the tubes, putting out 9 watts per channel.

It gets rave reviews from my customers, and a recent DIY tube tasting I went to in Pennsylvania. It blew away an all transformer coupled 300B amp (I thought sounded very good, so I felt mine wouldn't come close) among others.

Check it out here: http://gabevee.tripod.com/cgv300b.html

Ignore the first paragraph, as I will go ahead and order a half dozen One Electrons to keep in stock. Also, ignore the picture. I have a much nicer chassis and layout.

Looks more like the one in the center of this page:

http://gabevee.tripod.com/protopics.html

It can come in red or black. I use the Hammond steel chassis. Much sturdier than the aluminum. The pictures are my prototypes.

I use SS rectification because otherwise I would need another transfomer for the filament. This helps keep cost down. I also use DC on the filaments because there is virtually no hum.

Gabe
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Old 13th January 2003, 04:14 PM   #16
dhaen is offline dhaen  Europe
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Quote:
I am going to blow my own horn here:
Well said Gabe.

Cheers,
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Old 13th January 2003, 04:41 PM   #17
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maybeim,

Your 300B is certainly inspiring! And the looks!
Is there a step by step description on the net or
I just follow the threads on this forum?
Can you recommend a specific parts supplier?

Gabevee,

Can I input 220V in your amplifier?
It cerainly looks interesting.

perka
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Old 13th January 2003, 04:44 PM   #18
dhaen is offline dhaen  Europe
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Quote:
Gabevee, Can I input 220V in your amplifier?
And 50Hz?
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Old 13th January 2003, 05:01 PM   #19
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220V 50Hz? Yup.


Gabe
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Old 13th January 2003, 06:19 PM   #20
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Hi perka,

Thank you for the compliment.

The design is based on the JE Labs 300b schematic designed by Joseph Esmilla. His web page is located here:
http://users.starpower.net/je2a3/shoptalk.htm

There is also Derek Walton's web page, which gives a very descriptive construction article. His web page is what inspired my adventure into DIY audio.
http://indigo.ie/~walton/300b.html


Most of the help I received bulding the amps was provided here on diyAudio.com. Frank and John were always there to help and many others gave comments and suggestions.

I used "JE Labs 300b" in my posts related to the building of the amps. I started, as you are, with getting ideas. Although I had all ready picked a schematic for the build.

Many European builders have built there version of the monoblocks, so 50hz and 220v should not be a problem at all.

I am currently using 92db efficient speakers and there is plenty of bass and the mids and highs are magic. I do need to start working on some hum issues, but it does not distract from the music. It is a hobby, I have learned quite a lot and I do want to learn more.

Sourcing parts was fun and taught me much about quality and availability.

Digi-Key:
http://www.digikey.com/

Parts Connexion:
http://www.partsconnexion.com/

Angela Instrument:
http://www.angela.com/

ElectraPrint Audio:
http://www.electraprint.com/

Goldpoint:
http://www.goldpt.com/index.html

and many others.

Hope you decide to build your own project and what ever it is, you will have fun and the rewards are worth it!
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