Globe Champion 300 T2 high voltage power transformer

[ke7trp]

Spent some time with the 300 today since the 500C is now up and running

One of the HV power chokes was the culpret of all my trouble. Its fixed now. I also isolated the chokes with Rubber Vac line.  Oiled and tightened the fan and cleaned the Changover relay. 

Now I am back at Full power and when you key it, all you hear is the relay clicking.. No buzz at all and no chassis hum ect.. 

Going to install it back in the main operating position tomorrow and take the 500c down for upgrades. Good to have my old pal the Globe Champion 300 back!

Thanks to all for the help!

Clark

[N2DTS]

I always thought the chumps were neat transmitters, they look nice, compact package, but every one I heard of blew up, odd hard to get tubes, etc.
There cant be many of them left working...

Brett

[ke7trp]

Thats very odd you say that    You must be thinking of a different transmitter?  Its not compact by any means. Its nearly twice the size the valiant   Its a Brute and way over built in most areas. Its also around 130 lbs so about half again the weight of the valiant.

 I know of 4 or 5 running now.  Mine ran for nearly a year before needing service.  I think the reason we dont see more of them is simply because they where expensive and WRL just did not sell as many in comparison to the the Johnsons and others.

Clark

[nq5t]

My 300 has been reliable and runs just fine, although I haven't had it on air for a couple of years.  Had a 350 in High School (early 60's) paired with an RME 4350A, and bought this 300 in the mid 1990's to relive the glory days .. or something like that :-)

I'm fortunate to have a couple of sets of NIB AX9909s in case the (still) original pair decide to give up the ghost.  I have an extra shield bracket that I planned to cut holes in to mount cooling fans (a la the 300A), but that project keeps falling to the bottom of the list and more than 10 years later hasn't happened yet .... but there's always tomorrow.

[Jim, W5JO]

Typical of the 500 series, mine is finickey about loading on 75 and 160.  I use a tuner after it and it just plays fine.  Have been using it regularly for 3 years now and it does not have a problem one.

To cure the 300 ohm impedance problem on 160, I changed the bandswitch to one out of a DX 100, added an L coil and changed the load cap to one that has 450 pf.  I now loads into 50 ohms on 160 fine.

They are physically about the size of a DX 100.  They are shorter and a bit deeper but the width is the same.  Weight is about the same as well.  According to the book it is 105.  I did change the finals to 8643s to get away from the AX 9909s and sold them.  Has the same power out and sounds as good as a stock champ can.

[ke7trp]

MIne makes decent power on 160. About 140 watts with 100%. I never bothered to mod it. On 75 it will do 175 easy. I run it about 150 most of the time on 40, 75 and 160. I band change it daily. Mine is alot heavier then 105. Who knows. Maybe they used different Iron in mine. Its an early one. My 9909s are strong. I have a spare set of Tungsrams off ebay. They load to no more then 100 watts. They work great but just have less power then the Amprex.

My Champion has Roberts Audio modifications done. Its a simple kit that he sends you with a schematic. Its not expensive and he includes all the parts so you dont have to go around searching for the right caps and resistors.

This mod matches the D104 to the Radio properly, then bypasses the Speech filter and runs the audio straight. With a Stock D104 mic, the audio is just fantastic. People listened to me for 6 months on the stock setup and then heard me on the modified version and flat out loved it. This mod is reversable and no parts are removed.

Highly recomend the W0VMC kit.

I will be on the AMI net tonight on 3870 around 7 to 8 pm. Then hanging out for the round table with my 300 of anyone wants to hear it!

Clark

[N2DTS]

I know gk changed models over time, but I remember one I looked at 25 years ago, being about the size of a dx100. With dx100 size parts...

Really small for the power rating...maybe my mind is playing tricks on me.

Brett

 

[ke7trp]

MIne is working like it should now. Used it on 160, 75 and 40 last night and today. 200 watts out with 100% mod. Just runs along..

Also fixed the valiant while I was at it.. 18K VFO resistor was TOAST along with a Melted oA2. This thing was melted bad. Put 6 watts of 18K outside the VFO and a new tube. Back up and running..

Thanks to all your help!

The:
Champion 300
Globe 500C
Valiant
Ranger

ALL WORK! (for now)

 thanks to the help I got from this board and people on the air. Thanks alot to everyone.

Clark