[Amps] Peter Dahl transformers

Fri Feb 15 21:44:52 EST 2013

I dont own a LK-800 but I sort of specialize on souping them up, its amazing 
what they are capable of especially on 6M for the EME crowd who are likely 
nuttier than the RTTY crowd. I had enough of that stuff in the USN fixing 
the damn digital crypto decoding electronics and Model 28's.

Carl
KM1H

----- Original Message ----- 
From: "Jeff Blaine" <keepwalking188 at yahoo.com>
To: "Carl" <km1h at jeremy.mv.com>; <amps at contesting.com>
Sent: Friday, February 15, 2013 8:15 PM
Subject: Re: [Amps] Peter Dahl transformers

>I am sure that most of the RTTY contest community is happy that this mode 
>has not grabbed your fancy.  But if you ever do decide to RTTY contest, 
>Carl, that LK800 is a real sweet amp.  Even if Jim would consider it worth 
>of being an exciter-category amp only.
>
> 73/jeff/ac0c
> www.ac0c.com
> alpha-charlie-zero-charlie
>
> -----Original Message----- 
> From: Carl
> Sent: Friday, February 15, 2013 6:47 PM
> To: Jeff Blaine ; amps at contesting.com
> Subject: Re: [Amps] Peter Dahl transformers
>
> I dont consider ham RTTY contesting nor old buzzard AM linear 
> transmissions
> true CCS. RTTY doesnt interest me and has never been used.
>
> A  HB Class C AM amp and modulator here uses Gates 1000W carrier iron
> thruout and casual use at that level doesnt even faze it and helps hold 
> the
> house down.
>
> I do a fair amount of AM with a LK-500ZC/TS-950SD combo and the external
> Dahl is listed in ads as 1.7A CCS since it is a dual voltage and used for
> the LK-500/550/800/780 family. It never gets above room temperature at 
> about
> 400W carrier.
>
> OTOH when I test a LK-800 with 3CPX tubes on the HV tap (2850V full bore) 
> on
> AM it does warm up a bit at a 1000W carrier and after an evening of 
> yakking
> but still far from uncomfortable.  It certainly gets thru slopbuckets 
> trying
> to enroach!
>
> Carl
> KM1H
>
>
> ----- Original Message ----- 
> From: "Jeff Blaine" <keepwalking188 at yahoo.com>
> To: <amps at contesting.com>
> Sent: Thursday, February 14, 2013 1:50 PM
> Subject: Re: [Amps] Peter Dahl transformers
>
>
>> He eventually called the one I bought 1.4 KVA CCS.   I draw about 1800 
>> KVA from it in RTTY contest duty and the surface temp of the core never 
>> gets over about 45c.
>>
>> In fact, I was worried about the tradeoff of a high temp rise spec and 
>> even with the 200C components used, figured keeping an eye on the core 
>> temp would be a good idea.  So I had him build inside a thermistor which 
>> I had measured R vs. temp before hand.
>>
>> But the transformer never warmed up as much as the "CCS" model forecasted 
>> and I never implemented the temp monitor.
>>
>> Even for RTTY contest duty, what guys probably "need" out of a 
>> transformer is what we called ICAS 5/5 back in the day.  That core takes 
>> a lot longer than 5 minutes to cool down very much and it seems to me 
>> that it's a more applicable spec unless you are an AM or RTTY rag chewer 
>> where you like to ramble on for 30 minutes at a stretch.
>>
>> 73/jeff/ac0c
>> www.ac0c.com
>> alpha-charlie-zero-charlie
>>
>> -----Original Message----- 
>> From: Carl
>> Sent: Thursday, February 14, 2013 12:36 PM
>> To: Jeff Blaine ; amps at contesting.com
>> Subject: Re: [Amps] Peter Dahl transformers
>>
>> Yep, there is commercial CCS and ham/CB CCS; a big difference in weight 
>> and
>> price.
>>
>> There isnt a ham amp on the market that would survive commercial CCS at 
>> its
>> power capability.
>>
>> Carl
>> KM1H
>>
>>
>>
>>
>> ----- Original Message ----- 
>> From: "Jeff Blaine" <keepwalking188 at yahoo.com>
>> To: <amps at contesting.com>
>> Sent: Wednesday, February 13, 2013 2:42 PM
>> Subject: Re: [Amps] Peter Dahl transformers
>>
>>
>>>I had a custom done by EPD.  He will build exactly what you want.  You 
>>>can have complete control over the compromises and material set, if you 
>>>know what you want specifically.
>>>
>>> He told me once that most guys start out talking about CCS specs but 
>>> when the size and price come into focus, they start backing off from 
>>> that.
>>>
>>> 73/jeff/ac0c
>>> www.ac0c.com
>>> alpha-charlie-zero-charlie
>>>
>>> -----Original Message----- 
>>> From: Carl
>>> Sent: Monday, February 11, 2013 8:17 PM
>>> To: Paul Christensen ; amps at contesting.com
>>> Subject: Re: [Amps] Peter Dahl transformers
>>>
>>> While I dont doubt that I see a large number of CB transformers and Im 
>>> sure
>>> a number of  super power hams also. The giveaway that these are not for
>>> commercial use is the single phase construction no matter what the kVA
>>> except for 2 listed and one is for CB mobile use. He is also not shy 
>>> about
>>> it either and shows a photo.
>>>
>>> The ICAS ratings vs weight is also interesting and even less than OEM in
>>> Heath, Dentron, etc, and I do not see a Style description listed.
>>>
>>> Carl
>>>
>>>
>>>
>>>
>>> ----- Original Message ----- 
>>> From: "Paul Christensen" <w9ac at arrl.net>
>>> To: <amps at contesting.com>
>>> Sent: Monday, February 11, 2013 2:03 PM
>>> Subject: Re: [Amps] Peter Dahl transformers
>>>
>>>
>>>>A few months ago, EPD was highly recommended to me by Reid Brandon when 
>>>>he was still with Eimac.
>>>>
>>>> Paul, W9AC
>>>>
>>>> ----- Original Message ----- 
>>>> From: "Coffey" <coffey at starfishnet.com>
>>>> To: <amps at contesting.com>
>>>> Sent: Sunday, February 10, 2013 3:04 PM
>>>> Subject: Re: [Amps] Peter Dahl transformers
>>>>
>>>>
>>>>> Have no fear about Harbach not making transformers.  My friend Peter 
>>>>> Eggimann has been making HV transformers since 1983 and has all the 
>>>>> Dahl’s data and specs from years  ago. He has a nice manufacturing 
>>>>> facility in Wendell, N.C........EPD    ....Electronic Products Design, 
>>>>> Inc......website: epd-inc.com. I was a customer before I retired and 
>>>>> now as a hobby amp builder.......Gary, K4AVC
>>>>> _______________________________________________
>>>>> Amps mailing list
>>>>> Amps at contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>>
>>>>
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>>>
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