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Old 13th January 2003, 02:01 PM   #1
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Default Best 300B project

This will be the first time I build a tube amplifier.

I need to find a project that is very good value for the money and not too difficult like Al M's proac 2.5 loudspeakers.

I build the proac 2.5 and I heared the original proac 2.5 with 20W from four 300B and that was a perfect match so I know that this is the kind of tube amplifier I must build. I have 30w EL34 and the sound is good but not the same as the 300B.

What is the best and well documented project I should choose?

What is your favourite parts supplier for this project?

Thank you for helping me get started!

Perka
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Old 13th January 2003, 02:08 PM   #2
Joel is offline Joel  United States
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Default Re: Best 300B project

Quote:
Originally posted by perka
This will be the first time I build a tube amplifier.
Then you shouldn't start with a DHT amp that uses $150 tubes!
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Old 13th January 2003, 02:39 PM   #3
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Default Re: Re: Best 300B project

Quote:
Originally posted by Joel


Then you shouldn't start with a DHT amp that uses $150 tubes!
OK, if you tell me what I must pay special attention to, I'll avoid that kind of mistake.

I'm not afraid of mistakes, If it's a good build instruction. This is the essence of my question.

Perka
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Old 13th January 2003, 02:43 PM   #4
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Default 300B

Hi,

Quote:
Then you shouldn't start with a DHT amp that uses $150 tubes!
Joel,

I don't know where you get your tubes from but in Europe you can buy a 300B for 68 Euro exclusive of VAT.

And why not do it right form the start anyway?
We're here to help aren't we?

Cheers,
__________________
Frank
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Old 13th January 2003, 02:47 PM   #5
Joel is offline Joel  United States
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If you can build a push-pull 6V6 amp, a single-ended EL84, or something like that, without making any errors, and getting good results - then I'd say then you are ready to tackle a "keeper".
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Old 13th January 2003, 02:54 PM   #6
dhaen is offline dhaen  Europe
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Hi Perka,

I have no idea of your needs or your budget.

Presumably, you put some thought and consideration into your idea of a 300B amplifier.

I see you have been posting in the speaker forum. What efficiency and type of speakers will you use?

I'm sure you have seen that there are many designs available.
If you look at recent threads in the tube forum, you''ll see one that is finshed, and one that still in progress.

Many of us are not biased against these, for they do have many virtues.

It is true that a small push-pull amplifier could be built for much less money. Such an amplifier would sound quite different.

If budget was not such a problem, and my speakers were efficient, personally I'd go for the 300B.

I hope this helps,
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Old 13th January 2003, 03:14 PM   #7
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Hi dhaen,

I will use the proac response 2.5. They are not very sensible, but as impedance rareley go below 8ohm, they are not difficult to drive. I know that 20W about with 300B can drive them with very good results and as I have heared them with this.

Up to 1000usd is a reasonable budget. I guess this will cost me at least four times if I buy them finished from a well known manufacturer.

I know you can buy diy kits like "the Billy" from china for 700usd with 2x300B but then I only get 9W and I think my proac needs some more power http://www.diyhifisupply.com/diy_kits/the_billie.html

What is your favourite project?

regards,
Perka
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Old 13th January 2003, 03:26 PM   #8
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Default Re: 300B

Quote:
Originally posted by fdegrove
Hi,



Joel,

I don't know where you get your tubes from but in Europe you can buy a 300B for 68 Euro exclusive of VAT.

And why not do it right form the start anyway?
We're here to help aren't we?

Cheers,
Thanks!

perka
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Old 13th January 2003, 03:27 PM   #9
dhaen is offline dhaen  Europe
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Hi Perka,

Is it Push Pull or Single Ended, your thinking of?

An SE 300B will give less than 10 watts.
PP300B's can give 25 watts.
But the amplifiers will sound quite different.

Alternatively, there are some "Super" 300B types that can give 15 watts.

I'm sure you know that 10 watts is only 3dB less powerful than 20 watts.

Also, your choice depends on how much you want to do yourself:
Do you want to just assemble a kit? (Safest).
or,
Go for an existing design and source your own components. (This is not always the cheapest).
or,
try to design your own, using bits and ideas from other designs. (This can take a long time, and is risky if you are not experienced).

Whichever course you take, you can find help on this forum.
Even from those who disagree with your choice...

Cheers,
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Old 13th January 2003, 03:38 PM   #10
dhaen is offline dhaen  Europe
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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,
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