Yeah, we've got a very hefty 3 phase supply to give us 6kV DC.
Actually, I have a question regarding our transformer. Being 3 phase,
it has 3 windings of 4200V AC and the nameplate says that they are
rated at 1.5Amps.
Once rectified, we will have 6kV of course but my question is; at
what current rating? Will it be 1.5A or do we multiply by that by 3
because of the 3 phase working?
It doesn't really matter as the transformer is from a tv transmitter
and so it is CCS rated and we should have enough grunt for our YC156.
73, Alek.
At 09:31 AM 13/10/2009, k7rdx wrote:
>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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>>>>
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