AVO Valve Data Manual 23rd edition in OCR PDF format!

[Dekatron]

Thank you kellys_eye, Nick, Jac, Mike, Dickie and Bryan!

Today I got confirmation from Frank Philipse that it can be downloaded from his webpage here: http://frank.pocnet.net/instruments/...R-20150222.pdf

Frank has more AVO stuff here: http://frank.pocnet.net/instruments/AVO/index.html if you didn't know already!

/Martin

[tri-comp]

Hi Martin,

Thanks for the manual.
Certainly with errors in original data.
Here is one:
QQE04/5 is NOT equivalent with C1134, 6252, TT20, 55B/200A as stated.
It is equivalent with 7377 (Exact) and YL1360 (Heater different)

How do I know ?
Take a look at the attached picture.
That, and because I have 20 NOS saved for a future amp-project

rgds,

/tri-comp

[peter_scott]

Many thanks Martin.

That's much easier to use.

Peter

[John Caswell]

Excellent work Martin.
Thank you so much

John

[ionburn]

Thank you

[Bazz4CQJ]

My thanks also Martin; I think that non-UK nationals are only allowed Honorary knighthoods, but you do deserve that; Sir Martin Forsberg!

B

[RogerWalker]

I don't know what OCR software you used - but the result is magnificent! I attempted exactly this project every time a "new and revolutionary OCR program" was launched and failed every time, even when working from what looked like a perfect original. Something in the typeface used by AVO seemed to defeat the auto recognition every time - it ended up easier to retype every entry into a spreadsheet. I usually gave up in disgust after one or two pages. I still have hundreds of Omnipage files on my computer that I can now at last send to the recycle bin! I think "Sir Dekatron" would be very fitting tribute.
Thank you very much
Roger

[Dekatron]

Thank you tri-comp, Peter, John, ionburn, BAZZ4CQJ and Roger - I must agree, Sir Dekatron sounds nice!

I used Abby Finereader v11 for OCR from images scanned at 600 dpi resolution which I ran a few times adding special characters and other formatting properties and also for "learning" the font used, I used PDF-Factory Pro for making the PDF-file (used Acrobat XI Pro too but the finished version was made with PDF Factory PRO), Microsoft Excel and Microsoft Word for the editing and a lot of proof Reading plus some rule based formatting in Excel for grey rows and column properties.

/Martin

[Radio Wrangler]

Sir Dekatron? well, the mods could arrange that one. But it does involve you being tapped on the shoulders with a very big soldering iron.

Thanks a lot, especially for the easier version. I was struggling to find software that would join the split file. The end result is gorgeous, and it's an important archive, now preserved.

David

[Dekatron]

Thank you David!

If anyone ever finds errors in this version or if you know of corrections that I can add I might make a new version in the future.

/Martin

[Fourlegsgood]

I have been testing some 12AX7A / ECC83. The valves are, I think, completely interchangable.

However the AVO settings in the OCR version of the AVO book are different.

12AX7A (AVO 163 cog settings 841 228 410 0000 00)
ECC83 (AVO 163 cog settings 851 228 413 0000 00)

Radio Wrangler on here has kindly commented,

"It looks like the 12AX7A switch settings are garbled. Pin 9 gets a zero, disconnection, so the heater centre tap isn't used, so it would need 12v heating Pins 4 and 5 are the other hearer connections and are strapped together! so the heaters will be cold, which rather spoils its chances. The 12AX7A straps the grids together AND straps the anodes together, so even if the heaters were hot, you'd see both triodes in parallel.

David. "

Looks like an error in the OCR version?

[Dekatron]

Hi, yes you are correct, that is an error!

Earlier versions all show the VCM163 settings as: 841 238 410 0000 00, but that is still in error if you compare it to the 12AT7 and 12AV7 which both show: 851 228 413 0000 00 for 6.3V heaters.

The only other usable way to test the 12AT7, 12AV7 and 12AX7 is with a 12.6V only heater with this switch setting: 851 238 410 0000 00, but then the heater voltage switch has to be set to 12.6V too.

There are a number of differences regarding the 12AT7, 12AV7 and 12AX7 over the years and some errors seems to have crept in when the VCM163 was introduced as I see them in the special editions of the VDM for the VCM163, and then they have moved over to the ordinary range of VDMs but of course other errors crept in at the same time.

[Station X]

Was the 23rd edition the last ever published?

[Dekatron]

As far as I know the 23rd is the last edition, neither Megger nor the IET had any information on a later edition. There might have been revisions but I've only seen one revision myself. I know that the 17th edition had at least two revisions.

[Station X]

Thank Martin.