Help with the Heathkit DX20 CW Rig - UK Vintage Radio Repair and Restoration Discussion Forum

cor hummel · 9th Sep 2007, 4:51 pm

i have some problems with the rig dx 20 power getting down and down.
i have during transmitting a short noise patch and power in watt meter getting down the occ most go tunr to 90 procent de copler to 50 procent the end tube til 10 procent a getting not more at 10 watt .
witch amateur kan help me or have link fot info to repair this prioblem .
i have inspectit several times can found anny ting .
greetting from cor
holland

Station X · 9th Sep 2007, 5:23 pm

If you don't have it you can download the circuit here:-

http://www.vintage-radio.info/heathkit/index.htm

Your post is a bit difficult to understand. Have you tried operating the rig into a dummy load? What happens to the grid and anode currents when the fault is present?

cor hummel · 9th Sep 2007, 7:03 pm

its given 5 watts .
a short time ago its haveb an noise pets i can find the problem .
are there schematics from repair men to look at wots the problem coutn be .
greettting cor

cor hummel · 9th Sep 2007, 7:05 pm

i have de sheets but i can not see fisuely wats rong on the rig

Station X · 9th Sep 2007, 8:17 pm

As I said in post two operate the rig into a dummy load. If you haven't got one use a mains light bulb.

When the fault is present check whether the grid and or anode currents have changed. If the grid current drops the problem is in the oscillator/driver stage. If the anode current changes you have a fault in the PA stage.

Tell us what you find.

cor hummel · 10th Sep 2007, 11:20 am

hai i wil do so you told me .
perhaps is it the pa stage but i have not tested yet.
i think to night .
sorry for my inglisch
greetttings cor from holland/utrecht

cor hummel · 12th Sep 2007, 1:02 pm

i have do the test the diver seems to give output enouf de end tube olso .
but wen a move de chassis vrom the end tube wiggeling de power get some higher en lower out put.
i will test now nieuw elco,s en then i look agan its seems to bee bee de elco i thing the voltage is no 600 volt that is in the manual at the anode en de voltage at the driver is about 250 volt .
de tube vor making to make ormal voltage is making some tinkeling noise later wens its warm enouf its the tinkeling noise stops ..
greettting cor

cor hummel · 13th Sep 2007, 12:59 pm

I heve found the problem.
i have made probe for HF some c and diodes its works great find the problem with the end tube anode voltage war low at the 2.5 henri i fikst the henri lose contact its works great again i have started at 10 watt to heat some up than i have reac about 2 ours den at turn the rig to about 40 watt its works great a chort time at 50 watt.
thanks now i kan make music again.
at 48 mtr and 79 .
greetttings cor

9th Sep 2007, 4:51 pm	#1
cor hummel Retired Dormant Member Join Date: Sep 2007 Location: Utrecht / holland Posts: 6	Help with the Heathkit DX20 CW Rig i have some problems with the rig dx 20 power getting down and down. i have during transmitting a short noise patch and power in watt meter getting down the occ most go tunr to 90 procent de copler to 50 procent the end tube til 10 procent a getting not more at 10 watt . witch amateur kan help me or have link fot info to repair this prioblem . i have inspectit several times can found anny ting . greetting from cor holland

9th Sep 2007, 5:23 pm	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,286	Re: Help with the Heathkit DX20 CW Rig If you don't have it you can download the circuit here:- http://www.vintage-radio.info/heathkit/index.htm Your post is a bit difficult to understand. Have you tried operating the rig into a dummy load? What happens to the grid and anode currents when the fault is present? __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

9th Sep 2007, 7:03 pm	#3
cor hummel Retired Dormant Member Join Date: Sep 2007 Location: Utrecht / holland Posts: 6	Re: Help with the Heathkit DX20 CW Rig its given 5 watts . a short time ago its haveb an noise pets i can find the problem . are there schematics from repair men to look at wots the problem coutn be . greettting cor

9th Sep 2007, 7:05 pm	#4
cor hummel Retired Dormant Member Join Date: Sep 2007 Location: Utrecht / holland Posts: 6	Re: Help with the Heathkit DX20 CW Rig i have de sheets but i can not see fisuely wats rong on the rig

9th Sep 2007, 8:17 pm	#5
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,286	Re: Help with the Heathkit DX20 CW Rig As I said in post two operate the rig into a dummy load. If you haven't got one use a mains light bulb. When the fault is present check whether the grid and or anode currents have changed. If the grid current drops the problem is in the oscillator/driver stage. If the anode current changes you have a fault in the PA stage. Tell us what you find. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

10th Sep 2007, 11:20 am	#6
cor hummel Retired Dormant Member Join Date: Sep 2007 Location: Utrecht / holland Posts: 6	Re: Help with the Heathkit DX20 CW Rig hai i wil do so you told me . perhaps is it the pa stage but i have not tested yet. i think to night . sorry for my inglisch greetttings cor from holland/utrecht

12th Sep 2007, 1:02 pm	#7
cor hummel Retired Dormant Member Join Date: Sep 2007 Location: Utrecht / holland Posts: 6	Re: Help with the Heathkit DX20 CW Rig i have do the test the diver seems to give output enouf de end tube olso . but wen a move de chassis vrom the end tube wiggeling de power get some higher en lower out put. i will test now nieuw elco,s en then i look agan its seems to bee bee de elco i thing the voltage is no 600 volt that is in the manual at the anode en de voltage at the driver is about 250 volt . de tube vor making to make ormal voltage is making some tinkeling noise later wens its warm enouf its the tinkeling noise stops .. greettting cor

13th Sep 2007, 12:59 pm	#8
cor hummel Retired Dormant Member Join Date: Sep 2007 Location: Utrecht / holland Posts: 6	Re: Help with the Heathkit DX20 CW Rig I heve found the problem. i have made probe for HF some c and diodes its works great find the problem with the end tube anode voltage war low at the 2.5 henri i fikst the henri lose contact its works great again i have started at 10 watt to heat some up than i have reac about 2 ours den at turn the rig to about 40 watt its works great a chort time at 50 watt. thanks now i kan make music again. at 48 mtr and 79 . greetttings cor