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Old 1st March 2016, 05:02 PM   #1
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Join Date: Feb 2010
Location: S.California
Default Mable Audio 300B Amp KitI

Has anyone heard this amp? I am looking for a 300B, 6SN7 amp kit with 3.5K output transformers. I have been trying to build a 300B amp. I have been having problems with this design. So I have been contemplating a simpler design. I have all high quality parts to replace most of the parts in a kit. I also have a pair of Electraprint 3.5K output transformers. So I need a kit that uses 3.5K tranny's. I saw a kit from Mable Audio that states they use 3.5K's. There are a few kits on the bay that look exactly the same, but don't mention the value of the output tranny's. So does anyone know anything about the Mable Audio Kit, or about another inexpensive kit that uses 3.5K output Transformers?
I'm looking for a cheap kit with a good design because I have All the better parts, like WBT next Gen Silver RCA's, Teflon tube sockets, Better caps and resistors etc., etc.
On ebay there is an assembled amp by Douk Audio that looks the same except it looks like they added some bridge rectifiers on the filaments for the 300B's.
So if you know about these amps or others with 3.5K output transformers please let me know. Thank you very much.
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Old 1st March 2016, 05:12 PM   #2
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Join Date: Aug 2012
If you already have a lot of parts, why get a kit?
I'd look at a well supported design instead of getting parts you're not going to use.
Have a look at the site of forum member tubelab.com.
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Old 1st March 2016, 05:29 PM   #3
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Join Date: Feb 2010
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Default Tubelab

That's the design I'm having problems with. I get it working, and it works for a while and then craps out. I'm going to give it one more try, since I have the parts. But I'm just thinking ahead. I bought a bunch of the latest recommended Mosfets. Right now, as soon as the B+ comes up, I get a loud hum.
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