paul_b's latest activity

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    paul_b replied to the thread DIY 300B Redux.
    The Audyn copper caps sound nice, but those leads are pretty obnoxious.
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    paul_b replied to the thread General DIY Questions/Answers.
    Yes it is.
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    paul_b replied to the thread Building a Western Electric 124.
    You'd have to be more specific about what poorly wound is indicating. Is this really low primary inductance, excessive parasitic...
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    paul_b replied to the thread More Amp Construction.
    The aluminum for those is 1/8" thick and I use Keystone 4334 brackets to assemble. This requires a custom design and quite some...
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    paul_b replied to the thread Building a Western Electric 124.
    The better output transformer will push the high frequency problems further out, which allows for designs where the open loop gain...
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    paul_b replied to the thread Building a Western Electric 124.
    Putting global feedback around a resonance is what makes an amp unstable in the first place. Driving a transformer resonance with a low...
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    paul_b replied to the thread Building a Western Electric 124.
    I would suggest considering the opposite possibility that much greater stability is achieved if the output transformer isn't included in...
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    paul_b replied to the thread Tubes, it's part of the job.
    Some of those specimens definitely tell the story of how long you've been at this.
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    paul_b replied to the thread DIY 300B Redux.
    The cathode bypass cap creates a bit of a shelving filter in the low bass that can creep up and become audible if the cap isn't large...
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    paul_b replied to the thread DIY 300B Redux.
    https://www.mouser.com/ProductDetail/KEMET/C4AQGEW6210P3BK?qs=iLbezkQI%252BsgAttHZqv2P2w%3D%3D
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    paul_b replied to the thread DIY 300B Redux.
    The 300B cathode bypass cap is very much in the signal path. I tend to like the boxy DC link caps you can get from Mouser for this...
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    paul_b reacted to Wntrmute2's post in the thread DIY 300B Redux with Like Like.
    Things are sounding pretty good. First video is with both amps. Second video is with just one amp last night.
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    paul_b replied to the thread Biasing a Kailin 845 amp.
    It's probably worth doing some testing on the working one to see what the performance looks like. Test power output at 1kHz and power...
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    paul_b replied to the thread Biasing a Kailin 845 amp.
    What an odd creation, have you determined what the EL34 adjustment does?
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    paul_b replied to the thread DIY 300B Redux.
    28V appearing at the speaker binding posts would be 98W, so there's something else going on there. You have an adjustable current...
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