Fortra wrote:
> Roger,
>
> i would not bet 100 %, but as i recalled, Heathkit never made an amp
> with PAIR of 8873's. Yes they did one model, SB-230 with a single 8873.
Some where out there is an SB230 with two 8873s. I had one. <:-)) Of
course some one could have just added a second tube, but it looked like
it belonged there. OTOH I also had a solid state, 101 transceiver that
was beige or brown that was a one of a kind as far as I know. The
cabinet still used the rounded corners, but with a much smaller radius
than the conventional 101 series. It worked "OK", but was nothing
special as most prototypes aren't. It was digital read out and had a
remote digital read out VFR for running split either way, or transceive
on either. I should say it was supposed to as I never did get the remote
VFO to work. About the time Heath closed their doors there were a
number of odd, one-of-a-kind rigs that turned up.
73
Roger (K8RI)
>
> Regards,
>
> Nermin S58DX
> ----- Original Message ----- From: "Roger" <sub1@rogerhalstead.com>
> To: "Adrian Rees" <rees.a@btconnect.com>
> Cc: <amps@contesting.com>; <herzog@frontiernet.net>
> Sent: Wednesday, July 01, 2009 9:06 PM
> Subject: Re: [Amps] 8874?
>
>
>>
>>
>> Adrian Rees wrote:
>>> Erm, the MLA2500 uses the 8875 not the 8873. Sorry for being a pedant !
>>>
>> Thanks for the correction. My mind did a transposition there. <:-))
>> When I woke this afternoon I was wondering if I'd gotten that straight
>> and the first e-mail I saw answered my question.
>> The 8873 was the conduction cooled version of the tube. All 3 are just
>> physical variations on the cooling for the same tube.
>>
>> Heath made a nice little amp that used a pair of the 8873s. The whole
>> back of it was a heatsink. I finally set up a muffin fan to blow on it
>> because the darn thing got so hot. After that I could put my hand on
>> the heat sink even after and hour of running CW or SSB at tilt. I
>> think it was rated at 1200 PEP or carrier on CW. It certainly wasn't
>> CCS <:-))
>>
>> 73
>>
>>
>> Roger (K8RI)
>>>
>>> I have never seen a Dentron DTR-2000 and am curious to see the
>>> circuit diagram. I must admit I do like Dentron amps, even though
>>> they all seem to suffer from dodgy power supplies (still rebuilding
>>> my MLA2500B's supply !)
>>>
>>> Best wishes
>>>
>>> Adrian MW1LCR
>>>
>>> ________________________________
>>>
>>> From: amps-bounces@contesting.com on behalf of Roger
>>> Sent: Wed 01/07/2009 09:21
>>> To: Charles Harpole
>>> Cc: amps@contesting.com; herzog@frontiernet.net
>>> Subject: Re: [Amps] 8874?
>>>
>>>
>>>
>>>
>>>
>>> Charles Harpole wrote:
>>>
>>>> about 20 yrs ago, I bought a Dentron DTR-2000 for $800.
>>>>
>>>>
>>>>
>>>>
>>> The DTR-2000 used a single 8877/3CX1500A7 which is much larger
>>> physically than the 8874. I was getting 8877s at the time for $305
>>> (at a
>>> discount)and had a number of them (when the DTR2000 first came out) I
>>> liked the amp, but the voltage regulation was poor and IIRC a bit on
>>> the
>>> low side. I had one of the low voltage caps explode. It was loud
>>> enough
>>> to make my ears ring. It blew the can right off, which hit the top of
>>> the cabinet. The can looked like a 38 wad cutter that had hit something
>>> really hard.
>>>
>>> The MLA2500 used the 8873 (Aluminum anode and transverse cooling) I
>>> believe while the 8874/3CX400 is used in the old alpha 76 and 78
>>> series.
>>> Back then it was much less expensive.Now days you can get 3CX800s for
>>> less although new 8874s and 3CX800s from Eimac are quite pricey.
>>>
>>> 73
>>>
>>> Roger (K8RI)
>>>
>>>> I figured I bought the tube (which is what a new one
>>>>
>>>>
>>>>
>>>> went for then) and got the amp for free. It drives
>>>>
>>>>
>>>>
>>>> so easily and puts out POWER.... great tube.
>>>>
>>>>
>>>>
>>>> Anyone know how many (less than 500???)
>>>>
>>>>
>>>>
>>>> DTR-2000 were made???? 73
>>>>
>>>>
>>>>
>>>> Charles Harpole k4vud@hotmail.com
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>> From: hsu4qro@gmail.com
>>>>> To: herzog@frontiernet.net; amps@contesting.com
>>>>> Date: Tue, 30 Jun 2009 12:18:02 +0800
>>>>> Subject: Re: [Amps] NCL2000
>>>>>
>>>>> That is natural, My friend pick up a Heny Tempo 2001, the cost
>>>>> only $250, he ask me to find a pair inexpensive brand new NOS
>>>>> EIMAC 3CX8874A, a guy who in this list ask $400/ea.Could you help him
>>>>> to find inexpensve pair?
>>>>> 73!Hsu
>>>>> ----- Original Message -----
>>>>> From: "Herzog" <herzog@frontiernet.net>
>>>>> To: "Ham-amps" <amps@contesting.com>
>>>>> Sent: Tuesday, June 30, 2009 8:16 AM
>>>>> Subject: [Amps] NCL2000
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> RE: Hi,
>>>>>> I have some brand new NOS RCA 8122 for sale,I ask $350/ea or tell me
>>>>>> what's your best offer.
>>>>>> And another guy wanting parts of no description.
>>>>>>
>>>>>> Herzog, from Different world! Prices, I Had my NCL2000 up for sale,
>>>>>> asking $600; and no takers for 2 years. And it included 4 spares 811
>>>>>> tubes, plus the ones inside a perfect operating Ampflier
>>>>>> I finally just gave to antique collectors!! See if the AWA wants to
>>>>>> sell. (Antique Wireless Association.)
>>>>>> _______________________________________________
>>>>>> Amps mailing list
>>>>>> Amps@contesting.com
>>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>>>
>>>>>>
>>>>> _______________________________________________
>>>>> Amps mailing list
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>>>>>
>>>>>
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>>>>
>>>>
>>>>
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>>>
>>>
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>
>
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