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Success Stories If you have successfully repaired or restored a piece of equipment, why not write up what you did and post details here. Particularly if it was interesting, unusual or challenging. PLEASE DO NOT POST REQUESTS FOR HELP HERE! |
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27th Jul 2016, 10:24 am | #1 |
Octode
Join Date: Feb 2006
Location: Bristol, UK.
Posts: 1,042
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Toa Radio mic
Following from this 'Vintage Technology' thread https://www.vintage-radio.net/forum/...d.php?t=127942. I contacted Toa and enquired if I could buy a crystal from them. Their reply was that although they had two in stock there minimum order quantity was two and minimum order value was £50:00 and there would be postage on top of that, but they then carried on to say that as the set was ancient if I gave them my address then he would put one in the post FOC. Excellent company.
The crystal duly arrived and was fitted and with a small tweak on the tuning coil it worked. The manual describes the setting up of the multiplier stages by putting a spectrum analyser on the out put and adjusting each stage in turn for maximum output with minimum unwanted signals. As I don't have a spectrum analyser I couldn't use that method so I reverted to a method I used to align my old 2M TX. This was a search coil and diode/capacitor coupled to a scope. Loosely coupling the coil to the aerial I could make small adjustments to the multiplier chain and final aerial tuning capacitor so maximizing the output. Since it was only the crystal I had changed the chain did actually need any adjustment. http://s131.photobucket.com/user/g6a...g.html?filters[user]=30534112&filters[recent]=1&sort=1&o=1 http://s131.photobucket.com/user/g6a...g.html?filters[user]=30534112&filters[recent]=1&sort=1&o=0 Malcolm |
27th Jul 2016, 10:34 pm | #2 | ||
Dekatron
Join Date: Apr 2005
Location: Bewdley, Worcestershire, UK.
Posts: 4,748
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Re: Toa Radio mic
Great repair, Malcolm, well done!
Quote:
Quote:
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Phil Optimist [n]: One who is not in possession of the full facts |
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27th Jul 2016, 10:49 pm | #3 |
Dekatron
Join Date: Jun 2009
Location: Staffordshire Moorlands, UK.
Posts: 5,273
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Re: Toa Radio mic
That's heartwarming to hear. TOA took over one of the last UK radio mic companies a while ago (BBM Trantec). It's nice to know they still care! TOA have always had a good reputation for PA equipment.
edit: I cant get the image links to work either
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Kevin |
27th Jul 2016, 11:58 pm | #4 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,642
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Re: Toa Radio mic
Nor me. Could you please upload then directly to the Forum.
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28th Jul 2016, 8:59 am | #5 |
Octode
Join Date: Feb 2006
Location: Bristol, UK.
Posts: 1,042
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Re: Toa Radio mic
try these links:
The first shows the TX with the new crystal, the second the search coil and detector. Malcolm Last edited by AC/HL; 28th Jul 2016 at 12:55 pm. Reason: Images uploaded |