Typical Ebay these days as previous threads indicated. Read this article--??- this morning. Apart from the greed that Ebay shows today Covid has altered the landscape of global commerce to the point that interactive industries are adversely impacted. The HR used rig markets are potentially impacted also. Can't wait for the day when I can attend hamfests even with mask. Vacinated and ready!

开云体育

Ha ha - me too!? Well I guess if that's what you need to do.? But at $135?

PS

开云体育

Mike:

Congratulations from another 68 year old!

I've been following along with your adventure and have to commend you for your perseverance.? Nice to have it end on a positive, successful note.? Your documentation of how this came about will help someone else, no doubt, down the road, and to that end, I have saved a couple of those in case I ever need it.? While I have repaired a non-functioning TR-7 digital readout in the past, it was simple re-soldering job on the display pins that fixed the problem.? De-Oxit has always taken care of any other issues.

Thanks for sharing and enjoy your TR-7.? I think you may find, like many of us, that it will surprise you with its build quality, simple yet effective functionality, and is a joy to operate.? And I still think the TR-7 line, with all its accessories, may be one of the best looking "whole station" line-ups ever built....in either red or blue.

73,
Peter
VE7PS

HI Jim.

Thanks for your help

Its a confidence thing with me really but I have always been more comfortable with tube radio's.

?I have a rack full of restored and working KW & Eddystone kit.

The last couple of weeks have taught me that once you know how it works, it's basically the same fault finding techniques.

Whoever said that you cant teach an old dog new tricks was completely wrong, I am 68 !!

The TR7 is back in it's case, and will be back in the shack later today.

I have a Yaesu FTDX3000 here which is a superb rig but the TR7 can give it a run for it's money, it's only the Yaesu's superb Digital Noise Reduction that gives it the edge.

The TR7 has been running all evening on the bench? and it was hearing "W" on 80m SSB in poor conditions so you can't ask for more than that.

Kind Regards

Mike

G3ZCC

Yes, Willi switched to a larger LED after his initial run of kits in the original size. The one I got is original size, and I really prefer that to the larger size. Just my preference, to me the larger displays seem aesthetically out of balance with the rest of the radio. To use modern displays you either need to brew up your own board or buy the kit fro Willi. The original displays are pre-built modules that there is no direct equivalent to now.

73

-Jim
NU0C


On Wed, 24 Mar 2021 15:57:37 +0000
"Steve Wedge, W1ES/4 via groups.io" <w1es@...> wrote:

I've been seriously considering changing mine over to the blue digits. I've heard that they're also slightly larger (but still fit comfortably in the aperture provided for the display).

Steve Wedge, W1ES/4

Time flies like an arrow. Fruit flies like a banana.

Sent with [ProtonMail]() Secure Email.

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Wednesday, March 24, 2021 10:52 AM, Mike Davidsohn G3ZCC <mike@...> wrote:

Thanks Steve.

She seems fine just doing a tidy up now before I refit the case.

Kind Regards

Mike
G3ZCC

Congrats! This is how I learned what I know about the TR7. It has been a years long process, and I started in the mid 80s when the internet wasn't around to help!

73

-Jim
NU0C

On Wed, 24 Mar 2021 07:13:25 -0700
"Mike Davidsohn G3ZCC" <mike@...> wrote:

Hi Everyone

Success, I now have a digital display that is meant for the TR7.

Thank you to all those who offered assistance.

This project has been a very steep learning curve for my Tube specialist brain.

Loving those up/down buttons, fantastic.

Kind Regards

Mike

G3ZCC

Hi Steve

Kingbright blue LED SA39 -11PBWA,? UK RS Components part number 616-4576
digit height 9.9mm
unit height 13mm
FV 3.2 - 4.0v
RC 10 ua?
RV 5v
PD 120mw
DCFG 30ma
But you might try and contact DF4NW
Mine was one of his.

It's a complete kit.

My DR7 had already had the kit fitted but the whole board was a mess.

It looks just great now Steve plus 5mm blue diffused LED's with 330 ohm series resistor on the S meter and PTO dial, sets the whole rig up perfectly.

Kind Regards

Mike

G3ZCC

Thanks Steve.

She seems fine just doing a tidy up now before I refit the case.

Kind Regards

Mike
G3ZCC

Hi Everyone

Success, I now have a digital display that is meant for the TR7.

Thank you to all those who offered assistance.

This project has been a very steep learning curve for my Tube specialist brain.

Loving those up/down buttons, fantastic.

Kind Regards

Mike

G3ZCC

Hi Everyone

I think I may have found the problem with the A segment.
First of all as Jim said it is a DF4NW as that is imprinted on the mounting board for the LED's with a 2006 date on it.
I did some research this morning and a company called Kingbright have a bllue LED which is almost identical it is an SA39 -11PBWA

Here in the UK RS Components have them in stock under part number 616 - 4576.

They are 9.9mm common anode devices.

They sell for approximately ?6 $8.

Back to the problem, I downloaded? the datasheet for this LED.

The LED schematic shows segment A is pin 10,?

Pin 10 to the centre wire was open circuit.

There are tracks on the back of the vertical board, the open circuit was right at the top where the centre wire solders in.

it then links to the other Mhz digit pin 10.

Of course that wasn't getting any data either.

I have replaced all three wires and repaired the cracked print.

Will put it back together later? today and see if I have solved the problem.

Boy have I learned a lot from this project.

Kind Regards

Mike

G3ZCC

Good Morning Jim?

Sorry my brain was frazzled hi

What I did do before I went to bed was to scope the three wires and all of them have signals, which look pretty much the same.

So today as per your suggestion I am going to see if I can find a datatsheet with pin connections and check the segments with the meter.
Kind? Regards

Mike

G3ZCC

As I mentioned in a previous post they are common anode. The pinout on these is pretty standard so you should be able to google up a data sheet with a digram and check the individual segments with an Ohmmeter diode test function. Not only will they test as a diode but the meter will likely light them up when forward biased.
73

-Jim
NU0C

On Tue, 23 Mar 2021 19:02:40 -0700
"Mike Davidsohn G3ZCC" <mike@...> wrote:

Hi Roger

Just checked p21 to the centre wire and there is continuity.

As it is affecting the Mhz section looks like I may still have a joint of track problem.

Excuse my ignorance but are these common cathode or common anode displays.

Just in case I have to get a replacement.

Off to bed now as it is 2AM here, been at this all day.

Kind Regards

MikeG3ZCC

Hi Roger

Just checked p21 to the centre wire and there is continuity.

As it is affecting the Mhz section looks like I may still have a joint of track problem.

Excuse my ignorance but are these common cathode or common anode displays.

Just in case I have to get a replacement.

Off to bed now as it is 2AM here, been at this all day.

Kind Regards

MikeG3ZCC?

Hi Roger

Just seen your reply.

Looks like the problem now is with segment a the top one.

All the others are working.

Will check that centre wire tomorrow.

Kind Regards

Mike

G3ZCC

Hi everyone

Well after a day checking those three pins, fitting? 5mm blue LED's to the PTO and meter, fitting it all back together still a problem.

looks like segment a if I read the schematic correctly.?

Back to the drawing board.

Kind Regards

Mike
G3ZCC