Forum Posts

Val
Sep 22, 2022
In Show and Tell
Just finished my 300B amp. Started with J.C. Morrison, but ended up with SkunkieDesign as it really sounds outstanding . Paired it with EAR834 phono preamp build.
300B Build content media
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Val
Feb 10, 2022
In Questions & Answers
I am working on redesigning of my 300B amp, and will use schematic posted here. I understand the reason for having power transformer with all PS components on side rather in the middle how I have it, however it will be quote a big job on top plate (patching or complete replacement with a lot of drilling and filing). I would defiantly like to avoid remodeling of top plate if possible. I see a lot of 300B amps with middle power transformer location, but I am not sure. Is there chance to succeed? or it is a time to be brave and change everything?
300B Amp Layout content media
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Val
Jan 30, 2022
In Questions & Answers
I need help to figure out if power up hum on my recently Built 300B SE amp is normal, or what does really cause it? Every time when I power amp up, it generates very loud hum for 3-5 sec, than the hum goes away and Amp is working fine. The other mystery I can't solve, same amp does not like to work with signals generated by phono carriages (of cause coming out of phono preamp , and the preamp is not a reason ), as soon as stylus hit the record and moves little bit (even slight vibration), I can hear foreign notice on background very similar to start up noise, but much lower in the level. Interesting enough that all other sources of input signal like CD player , phone etc. do not have this issue. Any ideas will be really appreciated. BR/Val
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