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Recent content by Crusher

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    Big amplifier. Never finished. Dang!

    I hate seeing stuff like this when Dayton Hamfest is so close.
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    Black Cat JB2000. Make the Dracula sign.

    The best part is when they don’t realize it has a driver so they dump a 4 transistor amp into it. . Needless to say that didn’t end well. And I hate the filaments being in series.
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    Fat Boy 4 pill die?

    The switch powers fan, LED and keying circuit. If switch bad or cold solder joint. That will stop everything
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    New 32 pill is a dog :(

    Just gonna say this. I posted elsewhere before. HG tolerance and quality are horrible. Your basically using the equivalent of Harbor Freight.
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    Max AM RMS Output With Texas Star DX500V?

    I believe the potentiometer in those Texas Stars are actually 1W I believe. I have a couple here somewhere. A 2W won’t fit. Keep it around 25-35w per pill max for carrier out of 500. Get a fan kit for that 500 or you’ll be frying bacon in no time.
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    Linear Fans?

    Good deal. Glad it worked out.
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    Linear Fans?

    I’ve ran into something similar to that before. I used aluminum tape and covered over the wires and the non moving center of fan. This stopped rf getting into the DC fan.
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    High Voltage Tester

    I’d have to sit down later and do some math. But why couldn’t you float the B- to a certain point and then use the B- to measure current like in a tube amp? Instead of trying to measure or read something on the B+? I’m asking, not saying you should. Then maybe you could use 100uA meter. Still...
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    High Voltage Tester

    I’d like that kit. Would be handy for hi pot testing some of the doorknobs and vacuum capacitors I have laying around. Wonder if he sells kit or has schematic.
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    Texas star 350dx high drive keeps burning input rf choke..

    Ok. Using the knock offs. Since not a true Toshiba, the capacitance values across the transformers and on input and output will more than likely be different. Will need retuned. Also since the amp is biased, I wonder how hard they are pulling for idle current?
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    Texas star 350dx high drive keeps burning input rf choke..

    The transistors you installed I take it are HG?
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    Henry 2k classic

    A new pair of tubes will cost you about $550. So make sure it works and tubes put out. Otherwise you could have to invest in it about what it was bought for.
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    Hg 2879c

    These were matched by curve tracer, marked 63, I used Sencore TF46 and did check hfe. I went through 18 to find 6 that tested 41 & 42. Yes I used power device setting not small signal setting. I have built a few 2 device using the rd100fhh1 device. I like it. But still not really for a...
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    Hg 2879c

    This last batch I bought. Was fixing a straight 6 pill/ transistor amplifier. Set up as 2 device sections. Had to match every capacitor ( all inputs within 1 of, all capacitors across transformers within 2pf, capacitors from collector to ground all matched within 1pf and same for outputs) so no...
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    Hg 2879c

    Funny thing is they haven’t changed batch code in awhile. So theirs no way of knowing what you get. So every time you get a new batch, you have to build a pair on a tester and check the tune. Just to see if Tune is same or if more changes have been made.