[Amps] GU-74b amp by UX1UX

[Roger]

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 is using the Chinese FU728F which is the Equivalent of a 4CX1500B 
except for filament voltage and the centering pin size in the socket.

They are physically quite different from the GU84B

It will run 2500 PEP, or 2KW steady output with the voltages he uses.
I have one on the desk in my shop which is where I do most of my operating.

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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