mike stehr
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Posts posted by mike stehr
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18 hours ago, Woofers and Tweeters said:
His comments on Vince Meal and Motley Crue are golden...
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On 3/15/2020 at 9:22 AM, thebes said:
Still trying to finish up my rebuild of a Knight KN928 integrated.
You had an earlier thread where you mentioned the amplifier had low volume output. Did you solve that issue?
Did to the amplifier have hum problems before the rebuild?
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1 hour ago, BigStewMan said:
sounds like when I was about 20 ... parties would often have some sort of jungle juice which I think was every type of alcohol that you could find poured into some sort of fruit punch.
Spodie…(sp?)…where you add fruit. If you used minimal juice and good alcohol, they would turn out pretty good. The fruit was excellent the day after.
But everyone would buy dirt cheap liquor, or some clown would buy Gin...
1 hour ago, BigStewMan said:Then it was Bacardi 151
My liquor of choice in High School. That stuff will ruin your day...
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Is there much difference between KN728 and KN928?
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Hunting for the Sonic Ghost
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1 hour ago, Jeffrey D. Medwin said:
Reminds of the Eminem Godzilla video where he pukes Legos all over the floor...
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11 minutes ago, Woofers and Tweeters said:
I wanted them but there are too many red flags for my liking.
Usually folks want cash...
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27 minutes ago, Jeffrey D. Medwin said:
Why? On YouTube videos, they show for 10 seconds each, and its hard for me to either copy or study them!!
Can't you pause the video?
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13 hours ago, Jeffrey D. Medwin said:
If you can DIY, P.M. me, and I will offer ideas for you to consider as a circuit re-do.
Thanks for the offer, but I'm not re-doing anything to the circuit.
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I have three stage 2A3 amplifier. ☹️
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6 hours ago, ILI said:
At first sight, I think your amp has already been overhauled.
It has.
6 hours ago, ILI said:I read somewhere that these amps were diy kits. Is that correct? Perhaps not all of the models?
I think the kits were designated KT-250A. I think mine was a kit.
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So you are driving the grid of 50L6 directly from a 2volt output of a CD player? (or whatever puts out 2 volts RMS)
External PS?
6 hours ago, Wardsweb said:Now that is a simple circuit.
Indeed it is.
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23 hours ago, ILI said:
Nice! How does it sound? Have you done other renovations inside?
I just started power-up/biasing and troubleshooting.
I used snap-in capacitors for the voltage doubler.
They are quite smaller. So I mounted the caps to perf-board, and then attached the perf-board to the chassis.
I suppose it would be a re-cap/refurbish.
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Here's a Lafayette Stereo 250A I've been poking away on.
An Integrated push-pull EL86 amplifier of American manufacture.
Though some seem to think the output transformers could be Japanese.
The knobs are not original of course. Most the original knobs were gone when I acquired the amplifier.
My guess is, one Lafayette Stereo 250A in thirty will have the original knobs.
The brown inner concentric knobs are Eico. The white outer knobs are Fender. I had to drill out the Eico knobs to fit on the outer concentric shaft, and shorten the Fender knobs to affix to the inner shaft. I have no idea what the two outer knobs are pilfered from...
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I think you mean Lafayette LA-224? B or A...
It's a push-pull integrated tube amplifier, suffix A or B determines if it's ECL86 or EL84 for output tubes. Most likely manufactured in Japan.
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4 hours ago, polizzio said:
Can you imagine a 16 or 17 yo male teenager with a 760 HP Mustang mommy or daddy purchased them for their BD or Christmas?
Imagine the closed casket funeral because the said teenager turned into mush, from the large tree that wadded the Mustang into a ball
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The amplifier is set-up for individual bias pots for each tube, but I'm only using two bias pots for each pair until I source more Bournes trim pots.
What the Hum Is Going On Here?
in Talkin' Tubes
Posted
Something he could try...
First, leave the power supply xformer CT grounded at the first capacitor ground lug. It's supposed to be that way.
Did the amplifier have a three pronged power cord, or a two pronged plug to begin with?
You mentioned 120Hz hum, which could be power supply related...I dunno...
Try lifting the ground of the three prong power cord, and see if the noise goes away, (make sure the polarity is right) or power the sources to the integrated amp from a different wall socket.