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mike stehr

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Everything posted by mike stehr

  1. mike stehr

    Corona Virus

    Sweet and Sour Sicken
  2. "15uF FILM capacitors. (C1,2 & C3)" Are you sure you want to replace a 0.1uF coupling capacitor with a 15uF cap?
  3. Was that amplifier purchased through eBay or Amazon?
  4. Thanks for the offer, but I'm not re-doing anything to the circuit.
  5. It has. I think the kits were designated KT-250A. I think mine was a kit.
  6. 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? Indeed it is.
  7. 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.
  8. 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...
  9. 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.
  10. Imagine the closed casket funeral because the said teenager turned into mush, from the large tree that wadded the Mustang into a ball
  11. 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. schematic (1).pdf
  12. If anyone comes across one of these, be aware that the amplifier works best with a preamplifier or line-stage of some sort. The volume pots on the amplifier or more like input level controls, you dial those in, and then use the main volume control from the preamplifier or line-stage. This is shown in the video with the companion 445A preamplifier. https://www.youtube.com/watch?v=u35cUQCLmWY
  13. The shortest cut would be to pick the favorite tap, and just use it. Who needs attenuation...
  14. They use a switch to select each tap off the autoformers. The autoformer does the attenuation, the switch selects the taps. Unless you mean just using a stepped attenuator over an autoformer.
  15. https://www.aliexpress.com/item/32923115706.html?spm=2114.12010612.8148356.23.66866b83vRmPKu I have the stuffed ZeroZone GG linestage and power supply boards, all I need to do is source the power supply transformer.
  16. https://www.ebay.com/itm/263195361113?ul_noapp=true
  17. Yeah, don't buy a broken oscilloscope. You can do quite a bit of troubleshooting with a multimeter of some sort or a VOM. The scopes colleges usually flog are older models, and one should pay attention to calibration dates. If you are actually interested, talk to the right people, or go to some ham fests if they have them in your area. There is a chance you may find a better scope...you may have to pay a little more, but you'll probably do better than an off brand 4 meg scope. I have a B&K 10mHz scope I bought for 40 dollars years ago, and have been wanting to upgrade. A local retired friend hits the ham fests, so when he seen a Tektronix 2246 for 100 bucks in perfect working order, he couldn't pass it up. He has his share of oscilloscopes, so he passed it on to me for 100 bucks.
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