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Old 26th February 2004, 03:38 AM   #1
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Default Hi All from McKinleyville California

Hi All,

Just thought I'd introduce myself. I've been seriously involved with audio since 1958, when I built my first amplifier -- a Lafayette KT-92 five watt mono kit with one input.

Since 1998, I've been mostly designing and sometimes building tube amps and preamps. My smallest amplifier, a stereo 15 WPC 6BQ5 push pull design, actually made it into (limited) production in 2000. I'm on the verge of creating bills of material for a 50/50 watt stereo and 100 and 200 watt monoblocks. I've also been getting bugged by a bunch of local musicians to develop a guitar amp line, so I guess I'll be branching out in that direction, too,

I hope people will feel free to email me with questions they might have that they think I might be able to answer. I'll probably stick fairly close to the tube amp forum, but my knowledge isn't confined to that area. God knows, I've been around the block several times in the realm of consumer and, to a lesser extent, professional audio.

It's starting to rain like Hell again here in the metropolis of McKinleyville, so I'd better post this before the power goes out again.
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Old 26th February 2004, 04:39 AM   #2
SY is offline SY  United States
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Always nice to have another vacuum-head. What output tubes are you using for the big monoblocks? And where the heck is McKinleyville?
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Old 26th February 2004, 05:36 AM   #3
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Hi All,

Aw c'mon SY, you've never heard of Humboldt County? McKinleyville is about 5 miles north of Arcata, which is about 7 miles north of Eureka. It's also about 6 miles WNW of Blue Lake, which is where California Audio Labs was until they pulled up stakes and changed their name.

The monoblocks, as well as the 50/50, are configured to use KT88s, but are off-the-rack capable of being rebiased for EL34s or even 6L6s. The measured specs on the 50/50 are 65WPC, both driven, @ 0.3% THD, 1Kc; .06% THD @ 1W, 1Kc; FR 10~100,000 cps +/- .8 dB @ 1W; 20~40,000 cps@ 50W; noise .6mV with inputs shorted; damping factor >12 (depends on what output tube type and brand is used).

I'm struggling to get the distortion numbers on the 100 W amps to match the 50 W, and I have the transformers for the 200 W, but no prototype as yet.

Let me know where you want me to post my travails on these portraits in progress. And thanks for the reply.
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Old 26th February 2004, 06:07 AM   #4
SY is offline SY  United States
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Aw c'mon SY, you've never heard of Humboldt County?
Yeah, isn't that an, ummmm, agricultural area?

The tube forum is a logical place to post anything you'd care to share about these projects. You'll get three guys telling you that you ought to use single-ended DHTs, another two guys who will tell you that your problem is the transformer, five guys wanting to criticize your choice in wire, four guys telling you that anything more than two watts is a waste, and me telling you that you should be using sweep tubes in class B
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Old 26th February 2004, 06:12 PM   #5
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Hi All,

Yes, SY, Humboldt county is recognized as being one of the nation's prime purveyors of non-jumprope recreational hemp. The slogan of our local eclectic FM station is "Humboldt-grown radio without the rules".

I'm disappointed to find that their are no solder alloy fetishists on board. I was looking forward to some lively repartee over 60/40 vs 50/50 on screen grid connections.
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