Hi Roger: The Heathkit SB-230 used a single 8873 not a pair of them but Henry
Radio had a 2K Ultra that used a pair of 8873. Fern
----- 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 1:06 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
>>>>>
>>>>>
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>>>
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>>
>>
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