Sony KV 5000/5100 Differences?

[etype2]

I'm curious to know what differences exist between the Sony KV 5000 and Sony KV 5100 color Trinitrons and the years of introduction. I believe the KV 5100 was introduced 1976/77. I also see slight cosmetic differences.

[andy]

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[etype2]

Thanks Andy, about the power supply information. Wondering why Sony introduced a near identical set 3 or 4 years later with a new model number? Unusual for Sony. Must have been a major internal improvement? I have a 5100 also and just found out about the KV 5000.

[andy]

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[kx250rider]

Originally Posted by andy

I have a KV-5100, and I have the service manual for the 5000, and I did do some comparison when I worked on the 5100 a few years ago. There are some minor internal differences (mainly the power supply).

Basically that's the only difference. The 5000 had some quirks and expensive SCRs prone to failure in the power supply, and the 5000 was a little more reliable and stable (not that the 5000 was bad... It also is an excellent set). Also, the 5100 has a constant filament voltage lower than running voltage, so the picture takes a second to come on. The 5000 has nearly a constant working filament voltage, so the picture is instant-on. The CRT and most of the rest of the TV is identical, including the cabinet parts (other than the paint color and the side trim being black leatherette on the 5000 vs. bronzed aluminum on the 5100).

Charles

[andy]

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[etype2]

Thanks for the information, much appreciated. Anyone have solid data on the introduction dates of these two sets, such as a print date on the service manuals or owners manual?

[etype2]

My 5100 has the "Econoquick" label under the UHF selector if that helps.

[jr_tech]

Originally Posted by andy

Are you sure about that? I'm almost sure my 5100 doesn't have instant one. I thought the quick warm up was due to the unusual directly heated cathodes in the CRT.

I just did a "cold start" on my 5000 and 5200 (they had been unplugged for months) and both came up to full brightness in about 5-8 seconds. I suspect that these are both using directly heated cathodes (180mW or 1/4W)
jr

OTOH, my KV 9000 just took about 20 seconds from a similar cold start, for sure an indirectly heated cathode. If left plugged in the 9000 picture will come on in about 5-8 seconds, indicating that "standby" power is applied to the CRT heater.
The 5000 and 5200 still take 5-8 seconds if left plugged in, so no indication of "standby" CRT power (or perhaps that circuit is not functioning in my 5000 series sets).

[andy]

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[Electronic M]

I sscraped one of these a couple of years back...now I'm starting to regret it.
I did save the CRT, and many other parts if anyone wants them.

[jr_tech]

Originally Posted by andy

As far as I know the 5" CRT was the only one with directly heated cathodes.

KV4000 series perhaps?
Also, I just did a "cold start" test on my cute 3.5" Sharp 3LS36 (W) and it came up in about 5 seconds, so it must have a directly heated as well.
jr

[etype2]

Originally Posted by andy

Econoquick means there is no instant on circuit. Sony claimed to have improved the warm up time for their CRTs which no longer needed an energy wasting instant on supply, but I've never compared the cold start time. As far as I know the 5" CRT was the only one with directly heated cathodes.

This is good to know. I always equated "Econoquick" as the instant on feature VK members talked about in other threads of this forum. ie: short life etc.

[Sandy G]

KV-5XXXs of ALL iterations are STILL highly sought after, & tend to go high, even after what, 30-35 years ? There IS something magic about "Sony Trinitron", after all...

[Gerardn3]

The KV-5000 and 5100 are very neat little TVs. I've seen them occasionally up for auction.

On the topic of Econoquick...

I noticed that there are actually two different versions of the KV-9200 (9"). The original version had a switch for "Quick start" which was just pulling out the Picture knob. The second version was labeled Econoquick and seems to lack the switch to enable/disable it. The TVs seem otherwise identical.

Mine is the first version with the quick start switch. I tried turning it on, then turning on the set once, and it didn't seem to effect the start up time. My guess is that the set has to remain plugged in for some time, with the quick start enabled, in order to start up quicker, but I've never tried it for fear of shortening the life.

For reference, from a cold start my KV-9200 takes about 15 seconds after powering on until the CRT lights up, and then another 30 seconds or so until the CRT comes up to full brightness and stabilizes. As far as I can tell my TV is in good working condition and the CRT is strong as new so I always figured the start up time was normal.

I don't mean to hijack the thread or anything, but it seemed somewhat related and might be of interest.