[Amps] GU-74b amp by UX1UX

[Carl]

Will you guys get your GU's and FU's correct!

Carl
KM1H.


----- Original Message ----- 
From: "Roger (K8RI)" <k8ri at rogerhalstead.com>
To: <amps at contesting.com>
Sent: Friday, August 16, 2013 8:13 PM
Subject: Re: [Amps] GU-74b amp by UX1UX


> On 8/16/2013 6:12 PM, Louis Parascondola wrote:
>> The Chinese have come up with the F-257???? or whatever it is to replace 
>> the Russian tubes.  I think Rudy went to them already with Emtron
>>
>
> Rudy uses the FU728F instead of the GU84B.  The Chinese FU728F is 
> basically a 4CX1500B except it has a different filament voltage and the 
> centering pin in the socket is slightly larger than the one for the 
> 4CX1500B.  Physically the FU728F is quite different than the GU84B so it 
> is not a replacement for it.
>
> The FU728F is capable of 2500 PEP and 2KW carrier with the voltages 
> supplied. Tune for max screen current without exceeding any of the tubes 
> ratings, then back off on the drive a bit (without retuning) to get a nice 
> clean signal.
>
> If you run digital or a lot of compression it's likely to kick into high 
> blower which is a bit louder.
>
> 73
>
> Roger (K8RI)
>
>
>>
>>
>> -----Original Message-----
>> From: Fortra <fortra at siol.net>
>> To: n8de <n8de at thepoint.net>; k3it <gokoyev+k3it at gmail.com>
>> Cc: amps <amps at contesting.com>
>> Sent: Fri, Aug 16, 2013 6:06 pm
>> Subject: Re: [Amps] GU-74b amp by UX1UX
>>
>>
>> Hi Don,
>>
>> you have probably mixed GU-84B with GU-74b...
>> Tube ( s ) in OM-3500 were not GU-74b's...
>> Have not had such worries...bought a Dentron MLA-2500B,
>> with original tubes :) When they failed we will switch to 3cx800 :)
>>
>> Rgds,
>>
>> Nermin S58DX
>> ----- Original Message -----
>> From: <n8de at thepoint.net>
>> To: "k3it" <gokoyev+k3it at gmail.com>
>> Cc: <amps at contesting.com>
>> Sent: Friday, August 16, 2013 9:54 PM
>> Subject: Re: [Amps] GU-74b amp by UX1UX
>>
>>
>>> While attending the Friedrichshafen 'Ham Radio' gathering in June, I
>>> was told that the GU-74b is no longer being manufactured, so is not
>>> available in any large supply for replacement/repair.
>>>
>>> For this reason, the OM-Power people have discontinued the OM-3500 amp
>>> and replaced it with another model.
>>>
>>> Good luck es 73
>>> Don
>>> N8DE
>>>
>>>
>>>
>>>
>>> Quoting k3it <gokoyev+k3it at gmail.com>:
>>>
>>>> Does anybody see any obvious flaws in this amp http://goo.gl/lqPBie
>>>>
>>>> I could not find the actual schematic.
>>>>
>>>> I'm thinking of buying a Ukrainian made amp, for nostalgic reasons :)
>>>>
>>>> 73
>>>> Vasiliy K3IT
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>>>
>>>
>>>
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