[Boatanchors] sweep tubes (was Re: Galaxy V)

[Jim]

I had a Yaesu FT-101 EE
There was a fan as a stock accessory.  The finals lasted a long time....I 
used the radio mobile, contesting and Dx'ing, pushing it hard.

The only problem was the receiver.  It was terrible.....

Jim

-----Original Message----- 
From: Rodger Singley
Sent: Thursday, September 15, 2016 8:02 PM
To: Dennis DuVall ; Rob Atkinson
Cc: Boat Anchors List
Subject: Re: [Boatanchors] sweep tubes (was Re: Galaxy V)

There probably isn’t a single definitive answer about the Yaesu fan because 
over the years some distributors included it as a “bonus” and at times Yaesu 
also advertised deluxe promotional versions with various accessories 
included as stock items.  Later Yaesu would sell multiple variations of the 
101 and the higher power 401/560/570 series in different trim levels with 
higher trim levels providing the fan as standard equipment.  In any case it 
certainly is needed for long tube life.



When I first got my novice ticket the oldest operator in the local club 
(Mississippi Gulf Coast) was a former radio op on the presidential yacht and 
was a widower with few obligations and he would buy whatever piece of gear 
appealed to him.  When I first met him he had a Signal One CX7 which was 
most impressive to a young novice but he soon sold it and bought a FT-101 
which he liked far more.  Although the CX7 had many features and 
capabilities not available in the FT-101 he found the Signal One wasn’t very 
reliable and he was extremely happy with the Yaesu replacement.  A few years 
ago I bought a Signal One CX7 and after completely reworking the power 
supply it has been very reliable but I am using voltage regulators not 
available to the original designer back in the early 1970s.  The power 
supply board in the Signal One has multiple regulated positive and negative 
low voltage supplies for the various solid state parts but the same board 
also has higher voltage power supply components for the Nixie tube readout 
along with the high screen and plate voltages required by the conduction 
cooled 8072 final tube.  There was a lot going on with that board along with 
multiple connections to the various discrete component chassis heat sinked 
regulators so it isn’t surprising that the original incarnation had some 
reliability issues but it was a very advanced rig for the time (dual PTOs 
with dual receive, nixie tube digital display, no tune final, built in 
keyer, etc.) and is still very fun to operate.  I have a FT-101B also but I 
wouldn’t trade the CX7 for one now ??



Rodger WQ9E



Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 
10



From: Dennis DuVall<mailto:duvallddennis at gmail.com>
Sent: Thursday, September 15, 2016 5:26 PM
To: Rob Atkinson<mailto:ranchorobbo at gmail.com>
Cc: Boat Anchors List<mailto:boatanchors at mailman.qth.net>; Marvin 
Match<mailto:mvmatch at ece.utah.edu>
Subject: Re: [Boatanchors] sweep tubes (was Re: Galaxy V)



Rob,

I didn’t buy it brand new.  Came with the fan installed but also with 
installation instructions so the guy I bought it from may have hooked it up.
Understand that doesn’t really answer your question but someone else may 
know more.

Dennis D.  W7QHO
Glendale, CA

****************





> On Sep 15, 2016, at 10:43 AM, Rob Atkinson <ranchorobbo at gmail.com> wrote:
>
> On Thu, Sep 15, 2016 at 12:14 PM, Dennis DuVall <duvallddennis at gmail.com 
> <mailto:duvallddennis at gmail.com>> wrote:
>> With reasonable care sweep tubes can last a long time.  The original pair 
>> of 6JS6C sweeps in my Yaesu FT-101B are still going strong after 40 
>> years.
>
> Does your FT-101B have stock forced air cooling?  Or was that an option?
>
> Rob
> K5UJ

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