[Amps] Super buy on the Bay!

[Will Matney]

Mark,

Thanks, I knew I was kind of close, it's been a while since I was in one of those. They mention 450 watts with a 2517. The 2517 is not a stock CB, it was an export with a higher output power of around 20 watts PEP on AM. About 300 at most for a stock CB using 5 watts out or so. That was why I mentioned they would have done better with a third pre-driver stage. 5 watts feeding the cathodes of four 6JT6's didn't put out much drive to those four 6LQ6's, especially with 750 VDC plate voltage. The ham amps that used 6LQ6's like the one Amp Supply made, and I think Ameritron had one used around 1100-1200 VDC. That was really a little too much though as I found they ran the best at about 900 VDC. They called those a 1000 watt amp, but that was 1000 watts input.

What Ed tried to do was build amps with a high/low power. The low on most builders just cut the plate voltage in half. What he did was have two driver tank circuits and a series of relays to switch it over. On low, the four 6JT6's went to the low tank and bypassed the finals on out to the antenna. On high, he switched it over to another tank which matched the drivers to the finals. All that wire stretched around to relays and to two tank circuits caused a bunch of problems.

Best,

Will


*********** REPLY SEPARATOR  ***********

On 2/2/06 at 6:30 PM AA6DX - Mark wrote:

>Just for the heck of it .. info off of the Internet ...
>"On the Maverick there's 4 final tubes 6LQ6's, 4 drivers 6JT6A's, and one 
>keying tube, 6AQ5A..  Puts out about 450 watts driving it with the 2517."
>
>Whatz youze neeedz youze!  HIHI .. 73 .. Mark, AA6DX
>\specific
>than "Re: Contents of Amps digest..."
>
>
>Message: 1
>Date: Thu, 02 Feb 2006 18:42:14 -0500
>From: "Will Matney" <craxd1 at verizon.net>
>Subject: Re: [Amps] Amp for sale on eBay
>To: amps at contesting.com
>Message-ID: <200602021842140700.02FF5A60 at outgoing.verizon.net>
>Content-Type: text/plain; charset=us-ascii
>
>Alek,
>
>It had 4 drivers and 4 finals. The drivers were something like used as 
>vertical output tubes, I cant recall the number, 6JM6 maybe? The finals
>were 
>6LQ6 horizontal sweep tubes. The other tube was like a 6BA6 used to key
>the 
>relay off the RF. About 300 watts was the max with a good set of tubes.
>
>Best,
>
>Will
>
>>>>Just when you thought you had enough amplifiers, along comes a deal
>>that's
>>>>hard to pass up. Check this out!  Don't forget I saw it first.  No
>>>cheating
>>>>in line guys.
>>>>
>>>>http://cgi.ebay.com/VINTAGE-HAM-RADIO-LINEAR-AMPLIFIER-EXCELLENT-CONDITION
>>_W0QQitemZ5862246566QQcategoryZ48700QQrdZ1QQcmdZViewItem
>>>>
>>>>Bob W6TR
>
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