Nice story Alek...When you get the yc-156 done the gs-35b will be ancient
history too...Providing you have a psu capible of handling the
156...Cheers...Jim..K7RDX..
----- Original Message -----
From: "Alek Petkovic" <vk6apk@bigpond.com>
To: "Roger" <sub1@rogerhalstead.com>
Cc: <amps@contesting.com>
Sent: Monday, October 12, 2009 4:26 PM
Subject: Re: [Amps] Eimac tube on the 'bay
> No, the amp deck we are modifying is the driver amp or IPA from the
> 10kW Technical Materiel Corporation, 10kW transmitters. The same
> units can be seen in photos of the WWV site. We have,what used to be
> a US Navy communications base here in Western Australia,located at
> North West Cape. These units were used there and became surplus and a
> heap of local hams were able to get hold of them. This was about 20
> years ago and there a still quite a few floating around.
>
> The amplifier module uses a 6CL6 followed by a 6146W followed by the
> 8295A. From memory, with that lineup, we used to run 100mW into the
> front end and get our 1500W out at the tail end. It was of course a
> real chore to change bands with that setup so we did away with the
> first 2 stages and stuck 50 Ohm at the grid of the 8295A and so we
> were able to feed in 100W and only have to do the output tuning when
> we changed bands. The grid was biassed at -120V so with 100W drive
> into the 50 Ohms, we never went into grid current.
>
> We, (my local club) decided to strip one of these units down (donated
> by VK6JX) and just use the RF deck in a new enclosure and plonk a
> GS35B into it. It is a works in progress and we hope to have it on
> the operating desk by Christmas this year.
>
> That is why we have the tube, socket and chimney surplus. They are
> now sold and will be heading to a new home in Florida this week.
>
> On the subject of the bigger tube, we are also stocked up with all
> the parts necessary to build a YC156 amp. This will be for 80, 40 and
> 20m only. This project will commence immediately after the GS35B is built.
>
> Cheers from soon to be sunny, Perth
> Alek. VK6APK
>
>
>
> At 06:58 AM 13/10/2009, Roger wrote:
>
>
>>Alek Petkovic wrote:
>>>I have a good tested one (8295A) here out of VK6JX's TMC amp. It
>>>comes complete with SK184A socket and chimney. It was doing 1.5kW
>>>out when last fired up.
>>>
>>>We are doing a GS35b conversion
>>To an HT-33B?
>>
>>>and so the tube, socket and chimney are surplus.
>>>
>>Not the GU-73BB? It and the socket are a *little* more money, but it
>>is certainly capable of surpassing a few GS-35Bs <:-))
>>
>>73
>>
>>Roger (K8RI)
>>>Any offers?
>>>
>>>73, Alek
>>>VK6APK
>>>
>>>
>>>At 02:35 PM 12/10/2009, Roger wrote:
>>>
>>>
>>>
>>>>Roger wrote:
>>>>
>>>>>Larry wrote:
>>>>>
>>>>>
>>>>>> I wouldn't recommend powering up the HT-33b though, or you may be
>>>>>>returning to the restoration bench... Larry
>>>>>>
>>>>>>
>>>>>>
>>>>>Yah, it looks like some of those pits are pretty deep and PL-172s are
>>>>>notorious for going gassy while the 8295As have a good reputation.
>>>>>Maybe
>>>>>that's why a good tested 8295 runs twice the price of a good tested
>>>>>PL-172.
>>>>>The PL-172s have a designator of PL-172/8295A, but the true 8295A is
>>>>>metal ceramic while the 172 is metal with glass seals. Neither one
>>>>>goes
>>>>>for much (on average) untested. OTOH I sometimes see some untested "as
>>>>>is" tubes go for far more than I'd pay.
>>>>>
>>>>>
>>>>I should add that the 8295A is relatively rare and when found in tested
>>>>and in good shape are worth a small fortune. In addition to being
>>>>metal/ceramic they are about a 1/2" taller than the glass/metal PL-172
>>>>
>>>>73
>>>>
>>>>Roger (K8RI)
>>>>
>>>>>73
>>>>>
>>>>>Roger (K8RI)
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>-----Original Message-----
>>>>>>From: Roger [mailto:sub1@rogerhalstead.com]
>>>>>>Sent: Sunday, October 11, 2009 10:16 PM
>>>>>>To: n1miw@cox.net
>>>>>>Cc: amps@contesting.com
>>>>>>Subject: Re: [Amps] Eimac tube on the 'bay
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>Larry wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>> Looks like this tube didn't sell the first time, so he's trying
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>again...
>>>>>>
>>>>>>
>>>>>>
>>>>>>>Anyone have a sandblaster? Should clean up nicely with one of
>>>>those! I bet
>>>>
>>>>>>>the vacuum would need to be "put back in" though! :-) ...Larry
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>http://cgi.ebay.com/EIMAC-TUBE-8295-PL-172-Hallicrafters-Amp-more-NR_W0QQite
>>>>
>>>>>>
>>>>mZ370270597830QQcmdZViewItemQQptZVintage_Electronics_R2?hash=item5635d8f2c6
>>>>
>>>>>>We were talking about that one over on the Hallicrafters group last
>>>>>>week. I thought it'd make a good, colorful addition to a restored
>>>>>>HT-33B while keeping it all original. Don't spose that one had a bit
>>>>>>of
>>>>>>exposure to salt water or was left in wet packing for "some time"? It
>>>>>>was also labeled another hurricane casualty.
>>>>>>
>>>>>>73
>>>>>>
>>>>>>Roger (K8RI)
>>>>>>
>>>>>>
>>>>>>
>>>>>>>_______________________________________________
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>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>_______________________________________________
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>>>>>
>>>>>
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>>>
>>>
>>>http://www.qrz.com/db/vk6apk
>>>http://www.qrz.com/db/vk6py
>>>
>>>
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>>>
>>
>>
>>http://www.qrz.com/db/vk6apk
>>http://www.qrz.com/db/vk6py
>>
>
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