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300B Amp project


Guest David H
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Guest David H

This was my first attempt at a scratch build amplifier so I had some growing pains, however I love the sound and am pleased with the finished product.

Major parts used.

Power transformer - Dynaclone PA-774

Output transformers - Transcendar TT-312-OT

Choke - Hammond 10H PT-193J

Output tubes - Sophia mesh plate 300B

With the exception of a few value changes, this is built from the Shannon Parks GET*SET*GO schematic.

post-24405-13819832503692_thumb.jpg

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Guest David H

Under side

Justin Webber had the chassis support built, that worked perfect as a board mount., and stiffens up the chassis nicely.

post-24405-13819832505552_thumb.jpg

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Guest David H

I did some practice engraving on the two spare transformer covers. I am pleased with the outcome, but have a lot to learn about engraving.

post-24405-13819832526274_thumb.jpg

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Guest David H

Thanks for the comments.

This amp is approximately 7wpc with SS rectification, tube rectified 5wpc.

Cost of this build was right about $1K

Dave

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Guest David H

Update, I have been running this amp for about a week now, and still very pleased with the performance.

I contribute much of this to the 300B Meshplate tubes.

The only problem I have now is the desire to build another.

Dave

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Dave I like your engraving detail and the mesh plates look cool[Y]

My experience with designs similar to this one is it pays to have a good source (pre-amp, etc....) capable of driving the input stage otherwise they tend to be a little soft in dynamics...but...you can sure listen for hours without listener fatigue either way.

mike tn

ps..have you tried the 2A3 version for comparison?

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Guest David H

to save you some money try the TJ Mesh tubes. They are the exact same tubes made in the same factory...

You are absolutely correct, however I couldnt find TJ tubes any cheaper, I looked.

Dave

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Guest David H

Well Dave in that case the only other option to me would be the expensive EML tubes but, they are a step above anything else out there in my opinion..

Jay

No argument there, the EML would have been an excellent choice.

Dave

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