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Author Topic: Slow that D104 down  (Read 1204 times)
KB2WVO
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Posts: 158




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« on: March 18, 2017, 12:31:01 PM »

hello to all

wondering i rebuilt a d104. replaced the pot. i thought it was a 50K. but WOW is that thing fast... i can not even move it 3 degress and its blasting.

i guess i put a resitor inline . but what leg of the pot ?


thanks for any help..
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KC9NVP
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Posts: 183




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« Reply #1 on: March 18, 2017, 01:35:05 PM »

I found a schematic on http://www.northland-drifters.net/D104.htm and it shows a 5K.

David
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KAPT4560
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Posts: 317




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« Reply #2 on: March 18, 2017, 01:40:59 PM »

 It may also have an 'audio taper' 5K pot instead of being a 'linear' control?
This will give it more precise adjustment/slower resistance change at the lower end portion of the control movement.
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KB2WVO
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Posts: 158




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« Reply #3 on: March 18, 2017, 04:49:11 PM »

KC9NVP: probley thought i seen a zero on there lol. old eyes. lol .. ty ill have to find a 5k. think i have a few

KAPT4560: not sure the type of pot it used. it looks like a linear. but looks dont meen much lol .. ill have to ask the guy at the parts store what he has on hand.

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KE0ZU
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Posts: 282




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« Reply #4 on: March 19, 2017, 04:04:04 AM »

Basically there were two different amplifiers used in the D104.   One was a two transistor bipolar transistor version, which used a 50K pot



And a single FET amplifier, which used a 5K pot.

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KB2WVO
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Posts: 158




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« Reply #5 on: March 23, 2017, 06:56:34 PM »

ty for info.. ill have to open her up and see whitch one it is. i probley seen the 50k schmatic and didnt relize was 2 diff amps. gotta love them late closed eye nites lol ..
 
Basically there were two different amplifiers used in the D104.   One was a two transistor bipolar transistor version, which used a 50K pot



And a single FET amplifier, which used a 5K pot.


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KD8HMO
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Posts: 256




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« Reply #6 on: March 31, 2017, 02:48:53 PM »

While you are in there, you might want to replace the single electrolytic cap too.
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