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Post by aardvark on Nov 3, 2019 18:48:39 GMT -5
I am working on a HW201 of mine. I have replaced all capacitors and large resistors and some other resistors I have found that were open or way out of tolerance. I am trying to tune the am output but can only get 1.5 watt DK. I have tried aligning the transmitter section, but t202 and one of the t201 slugs do non't have that sharp tune point. I remember reading something about this and the capacitors in the cans but I can't find it now and I can't remember the specifics. I believe it may have been written by 2600. Can Anyone shed some light on this for me?
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Post by 2600 on Nov 3, 2019 23:13:31 GMT -5
Had a look at my bench notes, and the value for the secondary-side cap inside T202 is not shown. Oops. Oughta pin that down some day. Barkett doesn't seem to list that one. That same part is also used as T300, the receiver antenna input and as T800 and T801 in the noise blanker. They tend to get blown up from lightning surges, when there is a nearby strike and the antenna is connected. Probably why he ran out of them. We found a small 10mm substitute made by Toko 20 years ago. Was called "TK1410" and came from Digi-Key, but it was discontinued around 2006 or so. Didn't exactly fit but worked okay. All efforts to find old stock on it have failed. Toko's original catalog number for it was "KXNA-K4434DZ". Barkett has T201. Put "A20131" in the search box on his site www.goldeneagleradios.comDon't have a value for the two internal caps on that one on file, either. At least he can sell you one of that part. 73
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Post by aardvark on Nov 4, 2019 8:14:32 GMT -5
Ok Thanks 2600.
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mattbee
Mudduck
Tram & Browning Enthusiast :)
Posts: 38
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Post by mattbee on Nov 5, 2019 10:42:25 GMT -5
My Suggestion would be, I'd start checking tube voltages before replacing IF cans, just to make sure there is not an issue somewhere else.
Good Luck!
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Post by aardvark on Nov 12, 2019 13:32:36 GMT -5
Mattbee and 2600 I found my problem. Guess this is one for the books!! I found c709, the silver mica cap that feeds the neutralizing cap, shorted dumping the RF to C11 neutralizing cap. Replaced c709, neutralized the final and all tuned up as it is suppose to. Just FYI.
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