[MRCG] Jan 1L6 NOS

[Tim]

Hi Rich - Well the RCA tube manual says to run the 1L6 filament at 1.4
volts.  The GRC-109 manual shows 1.35V +/- 100 mV as a performance test
spec.
I've run this one for 30+ years at 1.4 volts, no problems but it's not on
24/7 either.  It sees maybe 30-40 hours per year...
I forget the dropping resistor circuit ID number but check the manual.  In
the small PP-2685 power supply the wirewound tapped adjustment resistor is
under the little "box" on the PS front panel...you don't need to
disassemble the PS...(It's internal to the big PP-2684 supply).

I never found the issued headphones so I just use some old HiZ types (or a
small external amplified speaker ala Radio Shack) with a HiZ input.

Phil at Fair Radio told me they sold "hundreds" of GRC-109 sets when
Tobyhanna Depot excessed them circa 1984.  Where did they all go??

Tim
N6CC

On Mon, Jul 27, 2020 at 6:39 PM Rich Arland <k7sz at live.com> wrote:

> In 1999 I bought a 5KW gas generator in case of emergency and/or Y2K. I
> have yet to have to use that genny.....so I bought a 6.5KW one to augment
> the first one and I have yet to use either one and I am in the middle of
> tornado/hurricane alley!!!!! I know the feeling with the full set of valves
> for the 109. Thankfully I have a good friend who deals in vacuum tubes and
> he will be setting me up with a full set of tubes for my 109, thus
> guaranteeing that I, too, will never need a replacement!!!
>
> Now, about the filament voltage on the 1L6...I understand that I need to
> set the filament voltage to 1.3V +/- .1V to insure that the 1L6,
> especially, doesn't krump. True? I am thinking that this is done by
> adjusting the slider on R4 in the PSU. True??
>
> Got a spare set of 4K Ohm H-45/U headphones you want to sell/trade or that
> I can beg/borrow/buy or steal?
>
> Vy 73
>
> Rich  K7SZ
> ________________________________
> From: mrcg-bounces at mailman.qth.net <mrcg-bounces at mailman.qth.net> on
> behalf of Tim <timsamm at gmail.com>
> Sent: Monday, July 27, 2020 8:36 PM
> To: West Coast Military Radio Collectors Group <mrcg at mailman.qth.net>
> Subject: Re: [MRCG] Jan 1L6 NOS
>
> The story on 1L6's is that they are used in the Zenith Trans Oceanics - and
> those guys are hoarding them,... $30 seems to be a reasonable price these
> days.  The other GRC-109 bottles are rather cheap by comparison. I have a
> full set of spares - thus guaranteeing I will never need any!  HiHi
> 2 is 1, 1 is NONE....
>
> Tim
> N6CC
>
> On Mon, Jul 27, 2020 at 5:31 PM Rich Arland <k7sz at live.com> wrote:
>
> > After a diligent search of ebay I found one selller offering a NOS JAN
> 1L6
> > for $30! I scooped that sucker up and it arrived today. Got me a standby
> > penta-grid converter!
> >
> > Vy 73
> >
> > Rich  K7SZ
> >
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