[Amps] 4CX1000A project

[Vic K2VCO]

I bought the blower on ebay. It is Japanese and the model number is B353-3. It is a 200v 
blower, so I used a tap on one of the transformer primaries. Unfortunately, I forgot the 
name of the manufacturer and the spec sheet I have is in Japanese!

On 10/28/2013 10:04 AM, Dave Trainor wrote:
> Vic, love the construction, can you tell me who's blower that is?  All the
> ones I have found so far are much thicker, the under chassis mounting is
> excellent.
>
> 73 - Dave, N8ZFM
>
>
>
>
> On 10/28/13 10:15 AM, "Vic K2VCO" <k2vco.vic at gmail.com> wrote:
>
>> I know. One thing I've done is included two ground conductors in the
>> control cable that
>> goes to the amplifier. So if someone were to disconnect the HV cable
>> while the supply was
>> energized, it would still be grounded (the supply can't turn on if the
>> control cable is
>> disconnected). I agree about the exposed pin.
>>
>> I thought a lot about using a separate power supply. I would much have
>> preferred a single
>> unit, but it would have been too big and heavy for a tabletop and I don't
>> have room for a
>> floor-standing unit.
>>
>> On 10/27/2013 8:20 PM, Al Kozakiewicz wrote:
>>> Just FYI, from Wikipedia:
>>>
>>> MHV connectors are presently considered by some as a safety hazard
>>> because of the
>>> possibility of high voltage on the exposed central pin when not plugged
>>> in,[1] and
>>> because the ground connection is broken before the power connection
>>> when demating. SHV
>>> connectors are designed to prevent these hazards, and cannot be mated
>>> to BNC
>>> connectors.
>>>
>>> Always have liked the idea of separate power supplies but have always
>>> worried about the
>>> safety of interconnects.  The one other person I know who did this did
>>> not use any
>>> connectors for the HV.  Accomplished the goal decoupling the supply
>> >from the amp, but
>>> requires tools and time to move either chassis more than the length of
>>> the umbilical
>>> away from each other.
>>>
>>> Al AB2ZY
>>>
>>> -----Original Message----- From: Amps
>>> [mailto:amps-bounces at contesting.com] On Behalf Of
>>> Vic K2VCO Sent: Sunday, October 27, 2013 11:03 PM To: Amps reflector
>>> Subject: [Amps]
>>> 4CX1000A project
>>>
>>> I've added a few more photos to my 4CX1000A amplifier page at
>>> <http://www.qsl.net/k2vco/4CX1000A/K2VCO%204CX1000A%20Amplifier.html>
>>>
>>> I finished the wiring as well as testing and adjusting the Tetrode
>>> Boards, which
>>> include the screen and bias regulators and trip circuits, the warmup
>>> timer, etc. I have
>>> not yet applied HV, which I intend to do when I'm fresh, and after I've
>>> cooked the tube
>>> with heater voltage only for a while.
>>>
>>> I'm working on adding fans to a '1000 watt' Drake dummy load to use for
>>> testing.
>>>
>>> -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/
>>
>> --
>> Vic, K2VCO
>> Fresno CA
>> http://www.qsl.net/k2vco/
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>

-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/