1986 Hitachi 25'' console. - Videokarma.org TV - Video

Dreamsbeard · #1 09-29-2014, 04:48 PM

Evening fellow VK'ers,

I recently picked up this nice Hitachi console television, and I was wondering if anyone could help me find the part# for the flyback? Normaly I would simply check the flyback for it but it seems the number faded/is nowhere to be found, but here's the catch : the television model and the chassis # are canadian, so they don't show in sams.

Can anyone help me ID this set?

Thanks!

PS if anyone is interested the canadian TV model is TS6460 and the chassis is G6NU2

Findm-Keepm · #2 09-30-2014, 11:58 AM

Looks like a CT2561, based on the parts location. I have a service manual in TIFF format, 3 Megs, so it won't post here. PM me your email address if you can accept large attachments. Flyback is a 2434641.

Cheers,

Dreamsbeard · #3 09-30-2014, 01:16 PM

PM sent!
Thanks!

Findm-Keepm · #4 09-30-2014, 03:06 PM

Two speakers? Actually, a CT2562.

Cheers,

Dreamsbeard · #5 09-30-2014, 04:15 PM

It's in the small details...hehe

Wait, does that means that the TV drives 2 speakers with the same amp as the 1 speaker model? Might explain why I have to put the sound setting at least about 50% of the range to have a decent sound.

Thanks!

Jon A. · #6 09-30-2014, 04:28 PM

It is actually a mono model right? If it is and the speakers are wired in series, more power would be used to drive them if the impedance of each isn't any lower than one in a single-speaker model.

Dreamsbeard · #7 09-30-2014, 04:39 PM

Good thinking there Jon,

The speakers are actually wired in parallel (thats what I think you meant), but as you suggested, its total impedance is probably lower than the same speakers connected in series. But I think the amp still has to drive them both...so all in all if both are 5.5W , the amp has to put out 11 watts to drive them both, and only 5.5w to drive only one. Am I making sense?

Jon A. · #8 09-30-2014, 04:58 PM

Wattage is just the power handling of the speakers. Driving them with a higher-wattage amp could blow them. It's the impedance that matters more here. Parallel wiring would halve the impedance of each speaker, so for example two 8-ohm speakers would be required for a mono circuit that requires a 4-ohm load. No extra power would be needed to drive the speakers.

rca2000 · #9 09-30-2014, 08:10 PM

I see ONLY ONE transformer-couple discrete amp in this typical 1980's hot chassis, and I DO NOT think it could produce 5W cont. The amp is near the rear of the chassis...only ONE channel. You can see it on the right side of the tuner. Those 2 sinks on the outs are NOT big enough for that sort of power. More like 2.5 W cont. And that would be consistent with many 80's model non stereo sets.

This actually looks to be older than 1986 chassis wise, more like 1982 or 83. By 86--stereo was becoming pretty popular on larger sets.

Dreamsbeard · #10 10-01-2014, 05:35 PM

Quote:

Originally Posted by rca2000

I see ONLY ONE transformer-couple discrete amp in this typical 1980's hot chassis, and I DO NOT think it could produce 5W cont. The amp is near the rear of the chassis...only ONE channel. You can see it on the right side of the tuner. Those 2 sinks on the outs are NOT big enough for that sort of power. More like 2.5 W cont. And that would be consistent with many 80's model non stereo sets.

This actually looks to be older than 1986 chassis wise, more like 1982 or 83. By 86--stereo was becoming pretty popular on larger sets.

I see, maybe this was of a sort of middle range set : 2 speakers, nicer finish, but older tech...

Dreamsbeard · #11 10-01-2014, 06:32 PM

Quote:

Originally Posted by rca2000

I see ONLY ONE transformer-couple discrete amp in this typical 1980's hot chassis, and I DO NOT think it could produce 5W cont. The amp is near the rear of the chassis...only ONE channel. You can see it on the right side of the tuner. Those 2 sinks on the outs are NOT big enough for that sort of power. More like 2.5 W cont. And that would be consistent with many 80's model non stereo sets.

This actually looks to be older than 1986 chassis wise, more like 1982 or 83. By 86--stereo was becoming pretty popular on larger sets.

So this is a hot chassis. Would you recommend that I buy an isolation transformer before I try to redo convergence on it? As you can see I am pretty new a this.

rca2000 · #12 10-01-2014, 08:04 PM

I do not suspect if has much to converge--I am sure it has an in-line tube I do not recall ANY set later than maybe 1983 using a delta tube. Even if it did--doing convergence should not require using an iso. Only of you do some WORK on it--will that be an issue, or are on a concrete floor or such while playing with the chassis.

Dreamsbeard · #13 10-03-2014, 06:16 AM

Quote:

Originally Posted by rca2000

I do not suspect if has much to converge--I am sure it has an in-line tube I do not recall ANY set later than maybe 1983 using a delta tube. Even if it did--doing convergence should not require using an iso. Only of you do some WORK on it--will that be an issue, or are on a concrete floor or such while playing with the chassis.

Well I did a quick clean and balance of the 3 guns(they where quite low and the red was smearing) and that seemed to throw the blue gun out of wack. The red and green are still properly converge, but the blue is now completely misconverged. If I remember correctly, the first two rings on the crt neck are for purity, and the others for convergence right?

The clean and balance also threw the grayscale off with a green tint, but after tinkering with it for 15 mins, it came back ok (it was perfect before). It was the first time I did a grayscale adjust, feeling proud of myself right now

Dreamsbeard · #14 10-04-2014, 11:58 AM

As I was reading this article :

http://personalpages.tds.net/~rcarls...s/converge.txt

I came upon the section about convergence, and the article says that the blue gun can only be ajusted alone in an horizontal axis...is that true? As stated before the only gun needing adjustment is the blue one, and it needs to come down on a vertical axis...is there a way of only adjusting the blue gun that way, or do I have the play with the other guns as well?

Thanks!

Findm-Keepm · #15 10-07-2014, 03:29 PM

Quote:

Originally Posted by Dreamsbeard

As I was reading this article :

http://personalpages.tds.net/~rcarls...s/converge.txt

I came upon the section about convergence, and the article says that the blue gun can only be ajusted alone in an horizontal axis...is that true? As stated before the only gun needing adjustment is the blue one, and it needs to come down on a vertical axis...is there a way of only adjusting the blue gun that way, or do I have the play with the other guns as well?

Thanks!

Dunno the arrangement Hitachi used, but here's the typical magnet arrangement - the purity rings are closest to the funnel (farthest from the clamp), and then you have the two sets of magnets - aft (closest to the CRT socket) is the 6 pole, and in the middle is the 4 pole. The attached images explain it better than I ever could.

Cheers,