Modern transceivers like my FT950, and probably many of the Kenwoods, use a
transistor to key the linear amplifier. Amps built in the last 15 years or
so are compatible with these low voltage levels, although it's a good idea
to consult the manuals for the amplifier and the transceiver. My
40-year-old amplifier has a transmit-receive relay which is perhaps 60 volts
open-circuit, and dozens of milliamps when energized. The inductive
kickback would have probably fried the transistors in my 950, so this relay
buffer circuit is necessary. You wouldn't need it if you were keying any
linear amp from your Drake transmitters. I still have my C line, but
haven't put it on the air since getting the FT950 four years ago. When
driving a modern amplifier from a tube transceiver, you should also think
about how you will deliver ALC voltage from the amp back to the transmitter.
The voltage ranges for the DC ALC voltage have varied a lot over the years,
and it isn't very easy to throttle yyour tube rig back to 40 watts and be
certain it will stay there. Nevertheless, having an amplifier is fun,
especially if the neighbors and your own family can put up with the
additional RFI.
73,
Lloyd Rasmussen, W3IUU, Wheaton, Maryland
Home: http://lras.home.sprynet.com
Work: http://www.loc.gov/nls
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of Howard, W A 9 Y B W
> Sent: Friday, April 27, 2012 7:28 AM
> To: [log in to unmask]
> Subject: Re: amplifier connections for TS570
>
> Hi Tom,
>
> I have a couple of questions.
>
> What is the "ARB704And" and what amp do you use?
>
> I am considering purchasing an amp but haven't decided what would be the
> best and most reliable way to go.
>
> I also have the Kenwood TS-570, a Drake "B" line and a Drake "C" line.
>
> I don't really want to have an amp for each station and would like to use
> it
> with what ever station I use.
>
> When I am in a hurry, I use the 570, however by far my favorite station is
> the Drake "B" line.
>
> 73's
>
> Howard #3
>
> ----- Original Message -----
> From: "Tom Behler" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Friday, April 27, 2012 6:14 AM
> Subject: Re: amplifier connections for TS570
>
>
> > Thanks, Steve.
> >
> > It's just nice to know that I can use the 570 that way, if my 590 were
> to
> > go
> > down for some reason.
> >
> > Still have to get the VS3 installed into the 570, and learn its
> functions,
> > but at least I have it and can do that on my own time now.
> >
> > 73 from Tom Behler: KB8TYJ
> >
> > ----- Original Message -----
> > From: "Steve Forst" <[log in to unmask]>
> > To: <[log in to unmask]>
> > Sent: Thursday, April 26, 2012 10:13 PM
> > Subject: Re: amplifier connections for TS570
> >
> >
> >> Tom,
> >>
> >> There are 16 or 17 different Kenwood rigs that use the same 7 pin din
> >> and pin outs are all the same. As we discussed a while back, only
> the
> >> TS-430 and 530 do not get 12 vdc to power the buffer from pin 7 of the
> >> din, and these 2 would need external power. Otherwise all pin outs
> >> are identical and all the other radios power the buffer from the
> radio
> >> via the din .
> >>
> >> So, use the 590 cable and enjoy.
> >>
> >> 73, Steve KW3A
> >>
> >> On 4/26/2012 10:00 PM, Tom Behler wrote:
> >>> Steve:
> >>>
> >>> So, just to confirm, the pin configurations are the same for both the
> >>> TS570
> >>> and 590???? I do run my amplifier through the ARB704And, but don't
> >>> worry:
> >>> I won't do that thing with the DC power connection again!!!! (big
> >>> smile)
> >>>
> >>> 73 from Tom Behler: KB8TYJ
> >>>
> >>> ----- Original Message -----
> >>> From: "Steve Forst"<[log in to unmask]>
> >>> To:<[log in to unmask]>
> >>> Sent: Thursday, April 26, 2012 9:53 PM
> >>> Subject: Re: amplifier connections for TS570
> >>>
> >>>
> >>>> Tom,
> >>>>
> >>>> Good luck with the new piece of gear. It uses the same large 7 pin
> din
> >>>> as the 2000, 590, and a bunch of other kenwoods. The 480 is a bit
> >>>> different and uses a mini din.
> >>>> So if you are going to use the RB-704 buffer, you can use the same
> >>>> "plug
> >>>> and play" cable that you use with the 590. And remember, just like
> >>>> with
> >>>> the 590, don't put external12 vdc to the buffer if using the plug
> and
> >>>> play cable, since it draws 12 vdc from pin 7 of the din.
> >>>>
> >>>> 73, Steve KW3A
> >>>>
> >>>>
> >>>> On 4/26/2012 9:26 PM, Tom Behler wrote:
> >>>>> Hello, all.
> >>>>>
> >>>>> Well, as some of you know, I recently purchased a Kenwood TS570S
> from
> >>>>> the
> >>>>> local estate sale of a silent key friend in our club.
> >>>>>
> >>>>> I just received the VS3 voice chip for the rig, and hope to install
> it
> >>>>> this
> >>>>> week-end, if I get enough grading of papers done in advance of
> finals
> >>>>> week
> >>>>> at the University next week.
> >>>>>
> >>>>> If I get the VS3 installed, I may just try the TS570 out over the
> >>>>> week-end,
> >>>>> although whether that actually happens remains to be seen.
> >>>>>
> >>>>> Anyway, I was wondering if I could use the same amplifier interface
> >>>>> cable
> >>>>> with the TS570 that I now use for the TS590? I also have an
> amplifier
> >>>>> cable
> >>>>> for the TS480, so perhaps that would work as another alternative.
> >>>>>
> >>>>> Thanks for any insights on this. ... I just don't want to do
> anything
> >>>>> wrong
> >>>>> here, since I know different rigs require different pin
> configurations
> >>>>> for
> >>>>> their interface cables.
> >>>>>
> >>>>> 73 from Tom Behler: KB8TYJ
> >>>>>
> >>>>>
> >>>>>
> >>>>
> >>>
> >>>
> >>>
> >>
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