The Secret Society of Lathe Trolls

You need to find a jewellers faceting machine, not cheap there is plans for one in Wireless World it is for Thorns I think if I recall, it's the same principle just you need a harder diamond cutting wheel to cut with. Not sure what you would need to cut diamonds with but it would work for sapphires ...

I know I have both the hard copy and the fake copy from online. The hard copy is the best one as it is the latest fullest copy with the greatest number of pages....I am suggesting that it should go online in a limited format and provide a future income. The interest is not going to go away but the i...

Why not just make it available as an electronic download so the print costs are NIL...?

Hello and the answer is no never come across anything other than adverts for it. It was not in production for long either and the only option is to draw out the circuit from the actual unit. Take it one stage at a time i.e. start with the front end or the power supply and then put all the bits toget...

Whilst you may not wish to make a controversy you are making a mountain out of a molehill, you have been advised where to go to get supplies. What exactly are we supposed to do if he does not reply. There are few options and you just have to be patient...He will reply in his own good time....if that...

Rome was not built in a day but just because it is called Instagram (and you have no idea if the person you are contacting gets one or a 1000 or more messages per day or that they have some other issue to deal with in the real world)does not mean that an instant reply will be forth coming. You may w...

Pretty sure the full manual is on this link (you just need to scroll through the topics or do a search on the forum) and if that fails then Google is your friend.....Rek-o-Kut Imperial might help to find it as well.

Well here you go then: https://worldradiohistory.com/index.htm Good Luck see you in about a month's time.......not kidding.....you can google BBC Technical instructions to find some of the BBC stuff. The other BBC reports are on the BBC technical website googling BBC technical Reports should get you...

I know I know I do word blindness as well and often go back to read something post it and then after see the mistakes it happens. There were BBC reports on the Fairchild, Presto heads and the BBC heads - the BBC heads got updated to Feedback type. The BBC did make good use of the equipment because t...

How does the sunk by Uboat work when the item would have been shipped across mainland USA? The UK lease lend was not this lower end stuff from Presto and it was leased to the BBC. Who assessed it did not look on it favourably and then modified their own equipment and sticking the Presto stuff back o...

I have the complete arm with the part you are looking for...PM with an offer I am in the UK which may be an issue....I have no use for it....

Hello Chris

PM Sent

I do not have a full manual the schematic tells you all you need to know, as it states AC voltages at test points on the valves and pretty sure it states in feedback links or the bottom of the schematic how to set bias points, it has been a while since I looked at it.

If you compare the two circuits the Grampian RA7 using 811A output tubes is similar to the Gotham PFB150 and the KT66 version will be similar IMHO to the Presto 92A (is it) that uses 4 x 807 output tubes (I have never seen the Grampian KT66 version of the schematic) but the BBC modified the Presto 8...

I went old school and got a Clarkstan groove inspection microscope on eBay, it should be with me in a couple of days. From the USA to UK, for those that wish not to be sick at how much I paid, do not go do a search to find out but around US$20 and same again for shipping. It has a built in reticule ...

It is the same, just need to flip back to the parent directory, I got the link in an email months back on another group I think. I thought it might be useful so I started to download some of them for future reference and review of contents at a later date.

There is bound to be other stuff in there of interest as well about discs and cutting, as well as associated subjects. Now others can go seek and find.......

Did they all come from here? http://www.extra.research.philips.com/hera/people/aarts/_Philips%20Bound%20Archive/PTechReview/ I had been working my way through these some months back, if you go back to the parent directory there may be others under some of the tabs. It took me a bit of searching to f...

Yes roughly he was that way with me he is very happy to communicate, to a point. It turns out that he is testing to see if you are worthy of him selling to you, as he only sells to whom he wants. That was my experience and at some point he will cease communication. My other advice is to search this ...

Capstan sleeves are not the answer either as it will adversely affect wow and flutter which is to be avoided. There are two ways or more of proceeding: 1. the most complex electronic drive - with a variable frequency drive - as covered by Norman Field but he was using it as drive the carriage mechan...

It's not the first time I have been threatened with that, sort of takes this back to the start of this thread. I still do not quite get it but I do see why it could be funny but I figure you have to be in that head space and it is late here in the UK. I am sorry if I caused the poster any offence an...