[ICOM] IC2KL Bias supply

[W. David Paperman]

Mac;

Just sent out a "correction".

Been a long day.

Thanks.

Dave, W5WP

D C (Mac) Macdonald wrote:

> I believe that would be 572B, not 872B.  872s
> are mercury vapor rectifiers (high power 866s)!!!
> 
> Mac, K2GKK/5
> 
> 
> -- "W. David Paperman" <wpaper at ev1.net> wrote:
> John;
> 
> The only suggestions I can offer short of a full test (exciter - watt 
> meter - dummy load) are the following; far from fool proof!
> 
> Appearance is usually a clue as to how well "respected" the equipment in 
>   question was in use.
> 
> Try to catch a whiff of smoke let out of some component. Serious smoke, 
> like a power transformer will linger for many months and is very 
> difficult to cover up.
> 
> If you can fire it up, preferably with a dummy load look at the bias 
> (idle current) indicated on the plate meter. If it is too low or too 
> high you may have bad or soft valves.
> 
> Pull the cover and take a look at the valves. Look for silvery 
> discoloration's on the plates of the valves. This is usually and 
> indication that they have been "ridden hard".
> 
> If you can put an exciter to the amplifier AND a dummy load I would 
> check through the tuning procedure not only for appropriate output but 
> also for parasitic oscillations.
> 
> I wish I could be a bit more helpful. The FL2100 series were excellent 
> work horses.
> 
> One other note: some FL2100 had 811 valves and some had 872B. I 
> personally would prefer the ruggedness of the 872B as opposed to the 
> 811. Although some say yes, in the FL2100 series they are NOT directly 
> interchangeable.
> 
> Good luck.
> 
> Dave, W5WP
> 
> vk6jb wrote:
> 
> 
>>Hello Dave,
>>I was reading your message and wanted to ask you a question.
>>I was thinking of buying an fl2100z and wanted to know what to look for when
>>buying one.
>>Is there any tests that I can do with a min of gear that will tell me that I
>>should avoid it like the plague.
>>Any assistance would be gratefully appreciated.
>>73 & 88's,
>>De John
>>Amateur Radio Station VK6JB
>>E-mail : vk6jb at amnet.net.au
>>Phone : Mob   +61 417 973 995
>>           : Home +61 8 6364 0259
>>
>>
>>
>>
>>
>>
>>----- Original Message ----- 
>>From: "W. David Paperman" <wpaper at ev1.net>
>>To: "ICOM Reflector" <icom at mailman.qth.net>
>>Sent: Sunday, January 08, 2006 11:45 AM
>>Subject: Re: [ICOM] IC2KL Bias supply
>>
>>
>>
>>
>>>Hi, Adam;
>>>
>>>No, I have no experience with Yaesu equipment other than the FT 101
>>>series and the FL amplifiers. The amplifier I was referring to was the
>>>SG-500. It is not as forgiving (well protected) as the IC2KL but is
>>>quite rugged and, above all, very easy to service.
>>>
>>>After several unacceptable experiences with both Yaesu and Kenwood I
>>>settled in with Icom, in great part due to the superb service support.
>>>
>>>I limit the time I have available for service work on Icom products
>>>(primarily supporting a local dealer and overseas clients),
>>>"boatanchors" and rebuilding TelRex rotators (I have small machine
>>>shop). After all, I was told when I retired that all I am supposed to do
>>>is chase DX, contest, and maintain my "estate", Ant-Hill. Obviously not
>>>the case!
>>>
>>>My IC2KL is also on its' 4th exciter. I started with an IC 720, then IC-
>>>740, a 756 and now a 756 Pro II. If the gods smile on me I will
>>>eventually go to the Pro III. The 7800 is great but all my gear,
>>>excepting the amplifiers and tower rotators, are powered by two large
>>>battery banks. Unfortunately, the 7800 is not "battery friendly".
>>>
>>>Be well;
>>>
>>>Dave, W5WP
>>>
>>>Adam Farson wrote:
>>>
>>>
>>>
>>>>Hi Dave,
>>>>
>>>>Is your Brand 'X' a Yaesu Quadra perchance?
>>>
>>>----
>>>Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>>>Icom Users Net: Sundays, 1700Z, 14.316 MHz
>>>Icom FAQ: http://www.qsl.net/icom/
>>>
>>>
>>
>>
>>
>>----
>>Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>>Icom Users Net: Sundays, 1700Z, 14.316 MHz
>>Icom FAQ: http://www.qsl.net/icom/
>>
>>.
>>
> 
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> 
> 
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> 
> .
>