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Author Topic: A Chinese Amp  (Read 54392 times)
KG6AMW
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Posts: 628




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« Reply #90 on: April 06, 2015, 07:31:57 AM »

It always seems to be the same story with U S hams - buy cheap, rave for awhile and then complain bitterly when it fails.     
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KM1H
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Posts: 2465




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« Reply #91 on: April 07, 2015, 03:39:25 PM »

Quote
QE, no, in fact it is the 160 meter position.

Which is a lot more common than 10M on many amps except on the SB-220 which is usually an assembly alignment issue. CBers also take out their share.

If it isnt a B+ issue then it is from corona and a brass washer over the contact will likely eliminate it. See the AL-80A from the 80's where it was first used that I know of. Nothing new here folks; I use the same idea to retrofit NCL-2000's, Clipperton L's, various Amp Supply, and other amps that have identical 160M padder problems.


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W3RSW
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Posts: 536




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« Reply #92 on: April 08, 2015, 05:52:04 AM »

One thing's for sure looking at the form/function of these central partition divided amplifiers, band switching PI-L network materials design, uP circuits, and all.

I'll bet Alpha rues the day they contracted out the 99 production to Bulgaria.

--Showing up now in discounted products, M&A ownership exchanges, dropping of models serviced, etc.  It looks like only a matter of time now until expiration.  Embarrassed

Seemingly absolute corporate fixation in bringing a high power, automated tuner to market isn't helping either. Yes it wil be spectacular, but with some  "degradation down to  US  legal  limit " of key components and features will be instantly copied worldwide at half the price.  They've done a lot of expensive trial and error research in getting a high power/high SWR, but non twin lead tuner to work.   ...as though the remaining 100 ft. of hammy ham bone's coax won't negate all the effort getting up the tower or out to bake the balun on the off-center-fed wires.

Amazing that Alpha had to make a major redesign, apparently forgetting that for minimum capacitance in a 'L' or later 'T' circuit that variable caps had to have very short lead lengths.  But hey, I sure like that back-lit knob.  Grin. Curious how many pre-orders they've gotten.
Well I have to say, if the tuner helps save them, then more power to them.

It is gorgeous.
http://www.rfconcepts.com/dream-tuner-development-news/
« Last Edit: April 08, 2015, 06:18:18 AM by W3RSW » Logged

Rick, W3RSW
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