🔴 Heathkit IT-28 Capacitor Tester Repair - Part 1 - No.1023

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Heathkit IT-28 Capacitor Tester Repair - Part 1
I begin to repair a Heathkit IT-28 capacitor tester, I check every resistor for correct values and find some problems with some of them, I also test the capacitors and take some voltage measurements.
I do a basic calibration of the IT-28 using resistors as per the IT-28 manual.
There is a Part 2 which finishes off the repair and also shows the alternative method of calibration using current measurements instead of resistors.
Part 2: TBA
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Опубликовано:

7 авг 2024

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Комментарии : 23

@wesleymatthews137 6 месяцев назад

Something I change in my resto’s of the it-28…I move the heavy 10w resistor from the wafer switch to a remote mount on the other side of the chassis where the 2.0 Mylar is located. Then the Mylar can be moved away from the hot tubes and wired directly to the power factor pot and selector switch pins. I also use a 10w 47k resistor and a 5w 33k resistor to clean up the power supply section. Fewer parts. Nice and clean.

@r3tr0nic Год назад

The dual primaries xfmr is one of the things that make these IT28/IT11 units awesome. Its a shame more gear from the day didn't come like that. I'll always have 120V and 240V capabilities at my bench, but I much rather have native support for 240V. All of these 1950s/60s vintage gear is a joy to collect and refurbish. Built like tanks, and def lasts when well looked after.

@wesleymatthews137 6 месяцев назад

I remove the 10W cement resistor from the delicate and irreplaceable wafer switch and remote mount them on the other side of the chassis where the 2.0uF cap is currently mounted. Then, I move the 2.0 uF Mylar cap directly wired between the selector switch and the power factor pot. I use one, 10w 47k resistor in the power section and a 5w 33k resistor. That really cleans up the unit.

@specialservicesequipment393 2 года назад

I have one of those, works great! I refurbished mine, had to replace all the capacitors, resistors were good, so were the tubes.

@SamSpastic Год назад

I see you reformed the first little black cap.

@TheDefpom Год назад

Nope, I don’t do that

@daveodessa 2 года назад

A nice addition to your range of test equipment Scott. (once you've finnished the refurb).

@t1d100 2 года назад

Nice DIY.

@hallpet45 2 года назад

Something about the Healthkits,it's style,looks,ageless.Found my Leatherman wave.Bought in 1999.Missing in 2009.Found in Mums,Teaching bag(Retired)2022. lastweek..LOL.Pete's Happy👍

@TheDefpom 2 года назад

I use my Leatherman eery day... probably best present my wife has ever given me.

@force4200 2 года назад

Great videos! Like when you repair :)

@FridayHouseXYZ 2 года назад

Make sure you make it in for a live stream. Well worth the time!

@force4200 2 года назад

@@FridayHouseXYZ witch day live ?

@force4200 2 года назад

I saw now friday witch time ? :)

@TheDefpom 2 года назад

@@force4200 I live stream every once in a while on a Sunday morning NZ time, so sometime on a Saturday for most people.

@andymouse 2 года назад

30:41 the eye changes from odd looking to closed on its own...cheers.

@TheDefpom 2 года назад

it was just my editing cutting out a bit.

@Chris_Grossman 2 года назад

The heyco tool is the correct one for the strain reliefs. The Chinese tool does not work.

@danishnative9555 2 года назад

You're correct Chris. You might have a hard time finding an original Heyco though.

@Chris_Grossman 2 года назад

@@danishnative9555 I found a used excellent condition Heyco #29 set on eBay at an affordable $25 a few months ago. I had been watching for one about a year. They are available new currently for $70 on Amazon in Los Angeles.

@KB1UIF 4 месяца назад

Hi, I'm curious why you said the values might be effected by the valve? Unless the component is connected across the heater/filament pins there should be no influence by the valve/tube while turned off. I guess you are thinking maybe a faulty valve shorted internally which is possible but not very likely. What I've found with these units is those 2 electrolytic caps are always very leaky and need to be changed. They will often blow the fuse they are so bad. Thanks.

@xConundrumx 2 года назад

I got lucky and managed to score a Wayne Kerr 6425 for about 200 euros all in (auction so auction costs, transport etc). That should be a big help if it works, army surplus so..