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Author Topic: Drake 2-NT  (Read 810 times)
NB4T
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Posts: 8




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« on: July 15, 2019, 05:38:47 AM »

 Anyone have a source for crystals that work with the Drake 2-NT Transmitters?
 Thanks NB4T
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K5DH
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Posts: 73


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« Reply #1 on: July 15, 2019, 05:55:00 AM »

Look for crystals at hamfests and SK estate sales, on eBay and the various online swap meet web sites, or via other hams.  Keep in mind that you need true FT-243 or HC-6/U crystals for your 2NT (or any other old tube-type transmitter).  Be prepared to pay through the nose for them.  40 years ago, you could find them at any hamfest in the "quarter each" box.  Today they bring $10 to $20 each, when you're lucky enough to find them at all.  Don't waste your money on the "QRP conversions" that are offered on eBay, as they are just HC-49/U crystals installed inside FT-243 holders.  They work fine in solid-state oscillators, but they can't handle the crystal current in most tube-type transmitters and will fail soonly. 

Consider buying a VFO.  Any of the vintage VFOs of the 1960s will work, or you can build your own from the myriad of circuits available in old ARRL Handbooks, other ham radio sourcebooks, and on the ol' interwebs.  The Ten Tec model 200 was a good mate for the 2NT, but they're hard to find and "spendy".  I sold one a few months ago, in stunning mint condition with original box and docs, for $250.  That's really "top dollar".  A decent one that works can sometimes be had for $100.  Heathkit, Johnson, Lafayette, WRL/Globe, Knight, and other makes are out there for less money. 

Good luck in your search.  The 2NT is a fine little transmitter that's a lot of fun to operate. 

Oh, one more thing.  I'd replace the filter caps in the 2NT's power supply before operating it.  Odds are they're bad and will fail when you power the thing up.  This is the voice of experience speaking...
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WA2ONH
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Posts: 532




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« Reply #2 on: July 15, 2019, 07:00:32 AM »

For future FYI...

WB4HFN Amateur Radio Websites - "The Drake Page"
http://www.wb4hfn.com/DRAKE/

Amateur Radio AF4K Page - ORIGINAL, OLD, AMATEUR BAND FT-243 CRYSTALS FOR SALE
http://af4k.com/FT243_CRYSTALS_Originals.htm

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73 de WA2ONH  <dit dit> ... Charlie
---------------------------------------------------------------------------------
"Never be satisfied with what you know, only with what more you can find out"
Dr David Fairchild 1869-1954 US Scientist
G3RZP
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Posts: 1313




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« Reply #3 on: July 15, 2019, 08:41:52 AM »

Interestingly, some crystal oscillator do well with the HC-49/U crystals because the higher Q of the crystal leads to less current. A number of people over here have successfully used HC-49/U in WW2 boat anchors. Not, I think in a Tri-Tet, though, which is a notorious crystal cracker.
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W9GB
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Posts: 3379




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« Reply #4 on: July 15, 2019, 05:34:40 PM »

Rex Harper, W1REX teaching Crystal Grinding at FDIM 2017 Buildathon
You Tube video, narrated by Rex Harper, W1REX
https://youtu.be/pm0YEpif2g0
==
Over the past few years interest in FT-243 crystals, for vintage rigs and *spy* radios,
has renewed radio amateurs interest in Crystal Grinding (Another Lost Art).

Rex Harper, W1REX demonstrates a Full FT-243 Crystal Grinding Session
(Easier than You Think)
https://youtu.be/SnQ39HPOlG8

Rex Harper, W1REX updated an earlier workshop that he presented with Darell Brehm WA3OPY, and Ron Hale AC5UR at the Ozarkcon 2006 QRP convention.

This Hands On workshop starts with an out of band surplus FT-243 crystal.
The quartz blank is removed and a new blank (pre-ground to ~ 7.00 MHz) is then hand ground to the desired QRP friendly frequency.
The workshop focused on the crystal grinding process as well as usage of a custom oscillator board and matching frequency counter for facilitate the grinding session.
For the FDIM 2017 Build-a-Thon, a Specific Kit for OSC/Freq Counter was created.

X-CHECKer Crystal Grinding OSC/FC kit
http://qrpme.com/?p=product&id=Q17

Crystal Grinding Accessory Pack
http://qrpme.com/?p=product&id=CGA

QRPme Miscellaneous Parts
http://qrpme.com/?p=parts
« Last Edit: July 15, 2019, 05:41:17 PM by W9GB » Logged
W9GB
Member

Posts: 3379




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« Reply #5 on: July 16, 2019, 06:17:59 AM »

What is the Operational difference between an Original FT-243 crystal and
FT-243 holders “re-stuffed” with smaller (HC-49/U) crystals?
Do you HEAR the difference?
https://youtu.be/07gIwVnAXrw

Since the closure of International Crystal Mfg. (ICM), radio restorers and
amateur radio operators have had to find other producers of frequency specific crystals.
** I have ordered modern HC-6/U crystals, for specific frequencies, used with Novice gear. **

QuartsLab
http://www.quartslab.com/

QuartsLab Ordering Instructions
http://www.quartslab.com/
« Last Edit: July 16, 2019, 06:27:57 AM by W9GB » Logged
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