quicksilver2112
New member
I thought this would be worth sharing; I recently purchased a 1987 Toshiba TV from a Craig's Ad. Cracked open the case to discover a 29mm neck. Target was a K4600. So far so good; both 9 pin and the donor looked to be compatible in all ways physically, with the exception of the yoke which is far smaller on the donor.
Impedance check at DC:
WG (K4600 Recipient):
V - 8.2Ohm
H - 2.2Ohm
Toshiba (Donor):
V - 8.8Ohm
H - 2.6Ohm
Prospects are great so far.
Performed the transplant to discover that the image looked like crap when displaying the convergence pattern from a Galaxian. After horsing around with various poor results for a couple of hours (swapping yokes) I discovered that the Galaxian Monitor (6-pin male connector) had a transposer (on its WG G07-CA0 Chassis PCB) that scrambles RGB, Ground and sync. So, I put the transposer in series with my test extension cable and bam, an image!
OK, two hours I wish I had back but valuable lessons learnt.
This was a total luck-out, but what a perfect monitor now. The native yoke, while quite different in size, worked with the K4600 in the end.
It's now in my Missile Command and performing awesome. MC has solid image screens that show any and all imperfections in the purity and any phosphor burn.
I've since been picking up any POS old 19" TV's I can find that are pre-1990. However, in almost all cases the tubes have a 22mm neck and therefore will not be directly compatible. My guidance is to look for TV donors with a manufacture date between (roughly) 1978 and 1990. Closer to 1980 the better for obvious reasons. (From what I've learned 29mm / 9-pin necks were phased out in the late 80's.)
Also, K (Blackdogmachine) showed me a Nintendo monitor retro-fit he did that incorporates a (albeit 100V Nintendo) 21mm neck tube with a compatible neck board. I plan to do some research on the chassis used there.
What a rewarding experience.
Impedance check at DC:
WG (K4600 Recipient):
V - 8.2Ohm
H - 2.2Ohm
Toshiba (Donor):
V - 8.8Ohm
H - 2.6Ohm
Prospects are great so far.
Performed the transplant to discover that the image looked like crap when displaying the convergence pattern from a Galaxian. After horsing around with various poor results for a couple of hours (swapping yokes) I discovered that the Galaxian Monitor (6-pin male connector) had a transposer (on its WG G07-CA0 Chassis PCB) that scrambles RGB, Ground and sync. So, I put the transposer in series with my test extension cable and bam, an image!
OK, two hours I wish I had back but valuable lessons learnt.
This was a total luck-out, but what a perfect monitor now. The native yoke, while quite different in size, worked with the K4600 in the end.
It's now in my Missile Command and performing awesome. MC has solid image screens that show any and all imperfections in the purity and any phosphor burn.
I've since been picking up any POS old 19" TV's I can find that are pre-1990. However, in almost all cases the tubes have a 22mm neck and therefore will not be directly compatible. My guidance is to look for TV donors with a manufacture date between (roughly) 1978 and 1990. Closer to 1980 the better for obvious reasons. (From what I've learned 29mm / 9-pin necks were phased out in the late 80's.)
Also, K (Blackdogmachine) showed me a Nintendo monitor retro-fit he did that incorporates a (albeit 100V Nintendo) 21mm neck tube with a compatible neck board. I plan to do some research on the chassis used there.
What a rewarding experience.
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