Topband: Amp Supply LK-500ZC

[Carl]

Ive had a ZC since 1986 and its been used pretty hard in contests and DXing 
but I keep it around 1200W. The original Eimacs are still putting out full 
power.

The only problem spot is on the front wafer where the 160M padder tap is 
right next to the ceramic insulator for the switch hardware. It can arc thru 
the nylon washer and Ive seen some that have actually burnt away the wafer! 
The cure is a Teflon washer and seal the area with corona dope or maybe even 
Q Dope, both of which are still available.

If you have some Teflon tubing of sufficient size slide it over the wire to 
the fixed caps and over the switch lug.

Other than that it is a remarkably well built and reliable amp. Its also 
about time to replace the electrolytics as they are about 25+ years old. 
Ameritron has a good price on their 270uF.

If you want less fan noise and good airflow use an EBM Papst 4600X. Gopher 
Electronics has the best price last time I looked a month ago as I use that 
fan in Dentrons and other noisy amps.
http://www.gopherelectronics.com/store/pc/viewPrd.asp?idproduct=3456&idcategory=0

Carl
KM1H



----- Original Message ----- 
From: "Edwin Karl" <edk0kl at centurytel.net>
To: <topband at contesting.com>
Sent: Friday, October 18, 2013 4:53 PM
Subject: Re: Topband: Amp Supply LK-500ZC


>I have both a 500ZB and 500ZC, both work fine on 160, no issues...
> Enjoy!
>
> 73
>
> ed K0KL
>
> On 10/18/2013 2:34 PM, Joe wrote:
>> I'm looking at a Amp Supply LK-500ZC amplifier.  It has the QSK board
>> installed. I will use it on 160,80 and 40.  However, I would like to
>> know if this amp has any issues on 160 as I will primarily be using it
>> on 160.  Any experience good or bad in general with this amp?  It seems
>> to get favorable reviews on EHAM however I have read conflicting reports
>> by others.  Thanks for any advice.  -Joe N3HEE
>>
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