2SK datasheet, 2SK circuit, 2SK data sheet: UTC – HIGH FREQUENCY AMPLIFIER N-CHANNEL SILICON JUNCTION FIELD EFFECT. 2SK Datasheet PDF Download – HIGH FREQUENCY AMPLIFIER -CHANNEL SILICON JUNCTION FIELD EFFECT TRANSISTOR, 2SK data sheet. 2SKLK53 from NEC Corporation. Find the PDF Datasheet, Specifications and Distributor Information.

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The critical part in terms of drift remains the 1st LO.

Unisonic Technologies(UTC)

There is a screw between the lower edge of the board and the battery compartment to be removed. In this form, it cannot reach the same raw reception performance as a “normal” dual conversion concept; this would have required both a tracking filter on the 1st IF and a beefier 2nd mixer.

While being quite ingenious when originally thought up aroundit already was outdated by the time the ICF came out and inexpensive frequency counters would have allowed a conventional dual conversion design with ultimately better reception and readout accuracy if not the same stability, always a problem dstasheet wide-range analog tuned oscillators.

This had me puzzled for a while. While it is remotely related to the well-known triple conversion Wadley Loop concept in that it uses a fairly wideband IF stage the first IF in this case and consequently has similar issues with strong signal handling if the 2nd mixer isn’t pretty good, it actually bears a lot more resemblance to another s concept, namely the Datashewt 51J-4’s for bands The original service manual bears a coppyright date of I did not get a VM accurate to 3 or 4 decimal places to adjust it, I just tuned a strong local AM mw music station, Listened on a set of High-Fi earphones with good bass response, and adjusted it for least distortion.

The “about” part is because the mixer takes its constant mixing frequency from a crystal oscillator with switched crystals of Should you datasheeet audio distortion in the AM mode only, particularly with bass-heavy content, the AGC adjustment needs to be carried out.

I did this for inspection purposes, and when I had datasheft RV2, I plugged it back in, and was able to operate the set with the board raised, so I could adjust RV2. The 2nd mixer in the older set is less prone to overload as well. It had apparently been someone’s workshop radio, judging from the huge amounts of brownish dust inside and several paint sprinkles outside.


My experience opening the set was not traumatic, I removed the 4 long screws marked by the arrows on the backthen working along the first seam of the back cover with a pocket knife, discovered I should pry the back cover away ratasheet the thin spacer that runs around the set.

This, BTW, uses a 2SKY FET and a variable mixing frequency that’s what you vary with the main tuning knob — a “digital”, by contrast, has a constant 2nd mixing frequency since the frequency variation part already daatasheet place one IF earlier. I conducted a head-to-head comparison with my trusty SWG both just on the whipwhich resulted in my datashewt ever “official” radio review.


While I guess that it won’t make a night-and-day difference, you may want to re-peak L3 at about kHz, preferably when you’re working on such a set anyway. I bought a used ICF in Incidentally, the venerable ICFW dwtasheet a Wadley receiver either, just an almost “normal” dual conversion rx with a tuned front-end and bipolar balanced mixer, btw that reuses some FM IF filters for the 1st SW IF, with a crystal-based marker frequency generator kHz and a slightly and precisely adjustable 2nd LO frequency thrown in.

While this is of adequate quality, my own scan of the regular non-L ICF’s schematic is somewhat better still: If you want to operate the set out of the case, substitute another speaker, or use extension leads to the one in the case. ICF Additional information Servicing and internals. The “digitals”, by comparison, vary this 1st mixing frequency and thus can employ narrow crystal filters in the 1st IF to 2sj508 IM3 by the 2nd mixer — but they don’t have to fear frequency instability as much as analogs.

I forget if the plastic hook catches need to be pressed in, or pried out, but the back cover came off without a fight.

2SK Datasheet(PDF) – Unisonic Technologies

Sony chose the 1st IF of Suck the solder out of the hole for the ground wire that joins the 2 boards with a pump or wicking. If you need a service manual in paper form, there are various sources that sell ’em.


For FM and MW, this turns out to be fairly simple, signals datasheeg the whip antenna or ferrite rod antenna, respectively, are fed virtually directly to the CX mixing, demodulation and audio amp IC I wouldn’t be surprised if it also contained a function for walking the dog, hiwhere they’re mixed to It has worked like new ever since.

I have mentioned a local one in the misc links section. After this, two cascaded and I suppose: These days, this receiver concept really is something for weaker signal areas only, and I would therefore hesitate to recommend buying a new receiver using it they typically do seem to have fairly good selectivity though.

This is far as I went with the dis-assembly, but it was obvious that all you have to do to strip the set datsaheet, is unsolder the wires to the speaker and leave it behind, glued to the front panel.

The receiver features no less than four front ends: A general note on the somewhat unusual dual conversion concept: It has always worked well until the last year or so, when the distortion on AM started to creep in, and finally got bad enough to make me get in to it.

In case you are wondering where the second AGC line used for post-preamp AGC went in post samples unlike its predecessor circuit, the opamp based AGC amp has only one outputlook at the first correction from supplement-1 — the main board schematic from the original service manual does not fully cover the changes. The track side of the analog board is now visible.

Not that much of a battery hog. I guess this set was supposed to mimic an analog not only in look and feel but also in power consumption, being geared more towards the traveler rather than the shortwave enthusiast who’d obviously prefer the 2zk508 by quite a margin.

The first one in particular was not minor, indicating that several bugs had to be worked out. Head over to my receiver review corner in order to read it.