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Old 30th October 2002, 03:27 PM   #1
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Default Picture of my first project 300B

Hi all,

I'm new to the forum so go easy on me. I thougt I'd share a picture of one of my monoblocks with you. It's my first project and I'm pretty proud. It sounds terrific although I'm not too happy about the hum (5mV)
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Old 30th October 2002, 03:42 PM   #2
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Very..very nice..never mind for a first time project..it is a fine example of diy ..period.

Did you use star earthing?
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Old 30th October 2002, 03:45 PM   #3
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yes I did. I'm trying to rewire the whole thing now so it uses different nodes for the different stages but it doesn't seem to make much difference.
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Old 30th October 2002, 03:51 PM   #4
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Mmm..looks like you know what you are doing...so I can hardly give any advice.. ;-(

Do you have a hum-pot on the filament of 300b? (AC/DC)..

Did you ground the outside of transformers/chokes/caps etc?

I use indirectly heated triodes..so I have very little hum even with AC filaments..
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Old 30th October 2002, 04:33 PM   #5
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Yes, there's a hum-balance pot on the 300B heaters.
Grounding the outsides of the trannies ? Do you mean the steel cases they're in or the transformer itself ? I use a powertransformer with a static shield and that's grounded but maybe it's a good idea to ground the cases as well... Where's my soldering iron....The cases of the capacitors share a groundplane (see picture)
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Old 30th October 2002, 04:39 PM   #6
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BTW, nice website...
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Old 30th October 2002, 06:42 PM   #7
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Default 300B

Hi Tomatito,

Lovely job!

Hup!Hup!Holland!

I see a handful of tantalum resistors (I think),GZ37,300B and what tube did you use as input?

BTW,I would leave the grounding as it is now.

Cheers,
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Old 30th October 2002, 06:46 PM   #8
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Thanks, you're making me blush. The resistors are Riken Ohm. The input tube is a 6SN7GTB, but tomorrow my 5692 red bases arrive. Can't wait to hear !
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Old 30th October 2002, 07:00 PM   #9
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Very nice job
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Old 30th October 2002, 07:28 PM   #10
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Default RED OCTALS

Tomatito,

Quote:
5692 red bases arrive. Can't wait to hear !
You're spoiling yourself rotten.

Doei,
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