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Duane Hess · 03-08-2017, 10:33 AM

Hi:

After some research it appears the key switch in a HP-46 is the same as the HP-9830, which was Cherry part number M61-0100 or M71-0100, pending on age of manufacture. (or similar variant of P/N)

Does anyone happen to have one or two of these they would be willing to part with? Please indicate what you would want for them.

thanks

aj04062 · 03-09-2017, 02:22 AM

Duane,

I found a few of these on ebay a few years ago. I presume you have looked there?

(03-08-2017 10:33 AM)Duane Hess Wrote: Hi:

After some research it appears the key switch in a HP-46 is the same as the HP-9830, which was Cherry part number M61-0100 or M71-0100, pending on age of manufacture. (or similar variant of P/N)

Does anyone happen to have one or two of these they would be willing to part with? Please indicate what you would want for them.

thanks

Mark Hardman · (This post was last modified: 03-09-2017 02:46 AM by Mark Hardman.)

(03-08-2017 10:33 AM)Duane Hess Wrote: Hi:

After some research it appears the key switch in a HP-46 is the same as the HP-9830, which was Cherry part number M61-0100 or M71-0100, pending on age of manufacture. (or similar variant of P/N)

Does anyone happen to have one or two of these they would be willing to part with? Please indicate what you would want for them.

thanks

I have an RFQ for quantity 10 with the following vendor:

Electronic Expediters, Inc.: M61-0100 CHERRY SWITCH,KEYBOARD EE# 753594 DATE-CODE: LOT# 23725

Their site says that they have 67 in stock. I'll let you know what price they come back with.

Mark Hardman

Duane Hess · 03-09-2017, 07:02 AM

AJ: Haven't noticed any on e-Bay at the moment. Searched in various ways, but didn't see anything.

Mark: That is very kind of you, please let me know.

Mark Hardman · 03-10-2017, 02:33 AM

(03-09-2017 07:02 AM)Duane Hess Wrote: Mark: That is very kind of you, please let me know.

Just received a reply. They are asking only $2.50 each. I'm refurbishing an HP-81 with several bad keys. Thank you for digging out the part numbers!

I now see that you can order from their web site without going through the RFQ process:

http://www.expediters.com/index.jsp?path...art=200258

Grab them before they're gone!

Mark Hardman

Duane Hess · 03-10-2017, 07:04 AM

Thanks Mark!

Have you received one in hand? Wondered as the picture does not match a M61; at least not what I have on my 46.

Other recent posts (mentioned above) listed websites where I obtained the numbers and pictures matched my 46. The picture looks like the switch from a 9825(?). Also the later versions of the switch might have been M73-0100 instead of M71-0100; can't find the reference now.

Will inquire with Expediters and try to clear up what they look like. If you get one in, please drop a post whether it works irrespective of its appearance.

thanks.

Duane Hess · 03-24-2017, 05:33 AM

Mark H:

Did you happen to order one of the switches & see if they fit?

I sent a note to Expediters & they did not reply; however, the listing disappeared from their web site & came back.

My inquiry pointed out the picture looks like a MX series switch, not a M61 type.

As long as the solder pins are in the same place and size (foot-print and height to key stem (slider)) match a M61, who cares?

Just wondered if you happened to have tried one before I order any. If not, guess I'm the guinea pig.

thanks!

Mark Hardman · 03-25-2017, 04:41 PM

I'm still waiting for delivery. I will let you know if they are compatible as soon as I have them in hand.

BRG

Mark Hardman

Mark Hardman · 03-31-2017, 01:17 AM

No joy.

The Cherry M61-0100 switches that I received are not at all the same form factor as the switches used on the HP-81. Even if I could find a way to mount the switch in the HP-81, the key caps do not fit on the stem of the switch.

It was worth the attempt.

Mark Hardman

Duane Hess · 08-08-2017, 06:21 AM

Mark Hardman:

Please check your PM.

Mark Hardman · 08-09-2017, 01:03 AM

(08-08-2017 06:21 AM)Duane Hess Wrote: Mark Hardman:

Please check your PM.

This is terrific news.

I'll let Duane post the details. I don't want to steal his thunder.

Mark

Duane Hess · 08-09-2017, 05:07 AM

Thanks Mark. Wanted you to know first in case you needed a switch for your 81.

For everyone's info, in a nutshell, talonix.com has Cherry M61-0120 switches NOS. The 46/81 used the -0100, but that makes no difference. -0100 is a blade stem and the 0120 is a 'T'; either works for the keykaps on the 46 or 81. (pulled the addition key from my 81 keyboard & it had a + "hole" like the 46)

Also an e-Bay seller had genuine Cherry M61-0100 & -0120 switches sold under the Tektronix label; P/N 260-1393-00. Those are probably gone, but its a good P/N cross-reference.

I'll just repost most of the memo sent to Mark:

- - - - - - - - - - - -

Hi:

Wanted to call your attention to:
http://www.talonix.com/shop/item.aspx?itemid=16644
and e-Bay item number 263065008989.

I have ordered 2 from each source. All switches work, have the same exact physical size, have the same key travel length, and solder lugs in the same place as the switches in my 46.

The e-Bay item returned a genuine Cherry M61-0100 and M61-0120. They were bagged with a Tektronix part number (260-1393-00). Good cross reference to keep in mind. One was absolutely brand new; the other looks brand new but the posts appear to have been heated, but no solder applied. Only 1 left! $9.95 + $2.67 ship.

The Talon were both M61-0120, as advertised. Seems to recall they had 14 left. $4.60 each + $6.44 ship for 2. Ship for 1 was $5.83; so guess $0.61 extra per switch.

All keys were obviously different ages of production. i.e.:
- where the word Cherry was located & font
- gloss/texture of plastic
- "collar" around key stem or not; however travel length & "bottom out" location is the same between the 4 switches & match exactly my 46.
- side "clip retainers" had different lengths (up/down) but exactly the same position & seating location as my 46.
- depression pressure seemed to be the same as my 46. Measured with my high-tech fingers!

The -0100 has a flat blade stem and the -0120 is a T. The 46 has a + "hole" for attachment on bottom, so probably the same for a 81.

The 4 different switches varied in side "grip" nubs on the key seating area of the stem. Tried all variances & the keycap from my 46 fit perfectly with each.

Since these are so difficult to find wanted to give you advanced notice . . . .