Thank you for the tip.
However, I have one on its way from Ten-Tec at a cost of $22.00 + shipping.
Nice folks to talk to, the tech I spoke with even gave me very good tips on how
to make the change out easy.
73, Gary...wa6fgi
----- Original Message -----
From: pfizenmayer
To: Gary Smith
Sent: Wednesday, January 27, 2010 2:37 PM
Subject: Re: [Amps] Good amp to buy
Gary - May be of interest - Hank K7HP
The fan is a Bi-Sonic 4E-115B-21 220 ma 115 vac 60 hz 2200 rpm 82 cfm at
0.11 in H2O at 41dba and the performance curves show about 50 cfm at 0.15
inches of H2O static pressure. This is 1.5 inches thick. Mounting holes 105
by 105 mm.
I was looking for a higher rated blower that I could run at reduced current
for standby and kick up in transmit or by sensing temperature like my Drake
L7.(or if not too noisy just let 'er rip).
I have no idea if its enuff air to let you run RTTY.
I found Bi-Sonic makes a model 4E-115B which is 240 ma at 115 vac 60 hz 3000
rpm 120 cfm at 0.27 in H2O 50 dba - it has the same mounting holes 105 by
105 mm. I assume from the web page that the same mechanical outline applies
to everything on that page , so the thickness should be the same. I have not
tried to contact the factory to confirm that .
http://www.bisonic.com.tw/04ac4e.html
email jackiechen@bisonic.com.tw
Mouser may carry it or be able to get it , I have not checked - they did
have the 4E-115B-21 when I checked sometime ago. I bought one of both and
they were less than $20 each a couple years ago.
Incidentally the bearings in my fan started squealing after only about 6
months of easy running - TT told me to remove the label and tighten the
three screws under the label and it would quiet it down . It is a royal pain
to get to but I did that and no squeal so far - After removing the tubes , I
also had to remove the RF choke in order to get to the label/screws.
To get the fan out takes a special long allen wrench which goes thru holes
in the 3-500 socket assy - TT says you don't have to remove that assy -
Maybe - but you have to watch what the wrench is rubbing - if I remember
right it rubs against the filament choke .
----- Original Message -----
From: "Gary Smith" <wa6fgi@sbcglobal.net>
To: <amps@contesting.com>
Sent: Wednesday, January 27, 2010 3:09 PM
Subject: Re: [Amps] Good amp to buy
>I recently purchased a Ten-Tec Centurion. Two 3-550 Z's, have seen
>1200-1300 on a bird wattmeter with 100 Po. Amp is twenty years old, parts
>are still available. am going to replace the muffin fan as it is doing
>when I was twenty years old. Likes to howl a bit. Not a bad buy, in
>today's used equipment market, difference between it and a legal limit amp
>(in db) isn't worth the cost or hassle. But it will not do that Po level in
>continuous duty.
> But it does have QSK as standard equipment.
> My .02 on this,
> 73, Gary...wa6fgi
>
> ----- Original Message -----
> From: Dave Hachadorian
> To: amps@contesting.com
> Sent: Wednesday, January 27, 2010 12:18 PM
> Subject: Re: [Amps] Good amp to buy
>
>
> There are eight 450V caps in the filter string. At 4KV, you are
> really walking on the wild side. The caps won't get warm, and
> they won't hiccup. One of these days, you will experience the big
> bang.
>
> Dave Hachadorian, K6LL
> Yuma, AZ
>
> --------------------------------------------------
> From: "Gary Smith" <Gary@ka1j.com>
> Sent: Wednesday, January 27, 2010 12:35 PM
> To: <Amps@contesting.com>
> Subject: Re: [Amps] Good amp to buy
>
> >> > I haven't seen a lot of the commercial QRO amps but my
> >> > Ameritron AL-
> >> > 1500 tapped for 4KV on the tube gives me 1500 key down for
> >> > between 35-
> >> > 40W on all bands.
> >>
> >>
> >> Here's an excerpt from the AL-1500 Manual:
> >>
> >> "NEVER REWIRE THE POWER SUPPLY TO BOOST
> >> THE HIGH VOLTAGE ABOVE 3700 VOLTS."
> >>
> >> At normal 3600 V, the Al-1500 puts out 1500 W with about 50
> >> watts
> >> drive, so why push the envelope by boosting the HV?
> >>
> >> Dave Hachadorian, K6LL
> >> Yuma, AZ
> >
> > Came that way when I got it a year ago; caps are not warm after
> > hours
> > of operation. Doesn't arc or hiccup in any way. I like the low
> > drive
> > requirement.
> >
> > Gary
> > KA1J
> > _______________________________________________
> > Amps mailing list
> > Amps@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
>
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