[Collins] 30L-1 Question

Tue, 9 Jul 2002 02:45:02 -0500

Yves,

Reread what I said.   He has two basic probs...too much filament voltage and
too high inrush current.  Your kit will not cure either.  (and just might
increase the inrush current leading to an AC switch failure.)  I did not say
his PA volts were too high.  Only that he had three options to reduce the
fil volts and inrush currents.

You kit does not address the issue of higher than 115/230 VAC line voltage.
It does use the high line volts to advantage for more output from the 811As.
However, if the zero signal idle current is allowed to run in the
neighborhood of 150 ma due to high PA volts, the tube life will be further
shortened.  There is about 250 watts of plate dissipation and 300 watts of
zero signal power to get rid of.  The tubes will run red without any signal.
The fix is to put some positive  bias on the fils via the center tap.  Abt 4
volts via series connected diodes will cool things down and get the idle
current down under 100 ma w/2 KV on the plate.

Yves,  I happen to like your conversion kit.  It just does not answer all
the questions.

Kind regards,

John
K0LFA

----- Original Message -----
From: "Wn4i" <[email protected]>
To: "johnf" <[email protected]>
Sent: Monday, July 08, 2002 6:44 AM
Subject: Re: [Collins] 30L-1 Question

> Hello  John .
>
> I don't agree with you .....the higher the plate voltage the better
specialy
> on SSB .......I use 3  30L1's   one on each bands  with my Power supply
kit
> since 1997 with no problems what so ever .and the Transformer is cooler
than
> before because of my new design voltage doubler .
>
> here is a copy of my FLYER:......
>
>
> Collins 30L1 Retrofit capacitor-diode kit
> Yes .  I still  have available 30L-1 Kits :Capacitor-diode and all
resistors
> on the same board resulting in only 7 connections to do ( compared with 15
> originally ) .
>
> The new board fits in the same space as the original Phenolic board but
less
> cluttered than the original board .
>
> This new power supply boards is capable of 800-900 watts output in SSB on
80
> meters whistling into the microphone .
>
> I started the design in 1995 for my own 30L1 , I am a product designer
here
> at Motorola . It is only an up-to-date upgrading kit .There is no change
to
> the basic Collins schematics and I am sure it is the way Mr.Art Collins
will
> have done it with modern up to date parts .....as follow:
>
> I am using 6 Bigger electrolytics  140 Mfd ( instead of 100 ) Computer
grade
> capacitors , made in USA  ,easy to find in the years 2000�s  and easy to
> replace with 2 screws .   8 , 1000 volts 3 amps diodes ( 8000 volts PIV )
> and all the resistors ,all on the same fiberglass printed circuit board
> .This is why I only have 7 wires left to solder to the amplifier , and
> easier to access from the top .
>
> Many  sold all over the world ....all the way to South-Korea ......since
> 1997 ,not one problem .
>
> The BIGGER caps are just like having bigger batteries for every peaks of
> your modulation
>
> Yes �Today more and more people realizes it is a good idea in SSB to use
> bigger reservoir capacitors for every peaks of your modulation. The bigger
> the better.
>
> A voltage doubler power supply like in 30L1 is only as good as the
> capacitors used .
>
> After using my kit, the transformer section is running cooler than before
.
>
> Yes ....it is because of the new design . �the capacitors are mounted
> vertically for better cooling instead of lying down on 25 watts resistors
,
> when you know that heat is drying the electrolytics capacitors over time .
>
> Only 7 wires to solder .
>
> Price is only $ 125.00 US shipped by Priority Mail ...Personal check is OK
> ( with your Call Letters ) Also a PayPal Member .
>
> INSTALLATION:
>
> You have 2 pages of very detailed installation instructions, one schematic
> showing the 7 wires , wire number, color , and a picture showing the new
> board .
>
> You can do it yourself ,as soon you know which side of the soldering iron
to
> handle .
>
> Only 7 connections to do on the new board .
>
> Please follow my instructions step by step  to the end .
>
> Or you can send it to me to do the job �.call me .
>
> In case of difficulty, please don�t hesitate to call me .I am well known
to
> Troubleshoot 30L1  by telephone or Email .
>
> Yves Wn4i����.561-689-8819�[email protected]
>
> Yves Pautard
>
> 5833 Dryden rd.
>
> West Palm Beach
>
> Florida 33415
>
> USA
>
>
> 73  Yves Wn4i
>
>
>
>
>
> ----- Original Message -----
> From: "johnf" <[email protected]>
> To: "collinsra" <[email protected]>; "Gary Harmon"
> <[email protected]>
> Sent: Sunday, July 07, 2002 3:56 PM
> Subject: Re: [Collins] 30L-1 Question
>
>
> > Gary-
> >
> > Barring a component prob, I'll bet your AC line is most of the cause.
> > Original xfrmr made for 115/230.  My AC Line is 123/246.
> >
> > This will increase the DC plate abt 8 pct.  So, you shud see abt
1700-1750
> > under load and abt 1900-2000 in stby.
> >
> > When you chk your fil volts it will also be high...like 6.6 or so.  This
> > will shorten tube life.
> >
> > You can do several things.  Install a Variac to adjust the AC.  (best
but
> > expensive) Install a bucking xfrmr to lower the AC line. (next best)
You
> > can put in series resistors in the fil leads to lower the fil to 6.3 VAC
> and
> > install inrush current limiters to save the power switch, fils and pwr
> > xfrmr.(the cheapest way out)
> >
> > I measured a 46 amp single cycle inrush surge on 246 VAC.  Installed two
6
> > amp/5 ohm limiters and dropped it to 20 amps which the switch will
> > withstand.   I also put 0.15 ohm in each fil lead to drop to abt 6.3.
> >
> > Kind regards
> >
> > John
> > K0LFA
> >
> >
> >
> >
> >
> >
> > ----- Original Message -----
> > From: "Gary Harmon" <[email protected]>
> > To: "Collins2 LIST" <[email protected]>
> > Sent: Saturday, July 06, 2002 3:31 PM
> > Subject: [Collins] 30L-1 Question
> >
> >
> > > HV reading with no load is almost 2,000 volts.  Warnings and manual
say
> > 1,600
> > > under load.  What say the experts?  I realize that the 4 meg meter
> > resistor
> > > might also be off.
> > >
> > > Thanks, gary
> > >
> > > ================
> > > Gary H. Harmon, Jr.
> > > K5JWK
> > > 6302 Robin Forest
> > > San Antonio, TX 78239
> > > (210) 657-1549 <Home>
> > > (210) 884-6926 <Sprint>
> > > ====================
> > >
> > > Sponsored by the Collins Radio Association
> > > http://www.collinsra.com
> >
> > Sponsored by the Collins Radio Association
> > http://www.collinsra.com
> >
>
>