Toa Radio mic - UK Vintage Radio Repair and Restoration Discussion Forum

Malcolm G6ANZ · 27th Jul 2016, 10:24 am

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

Phil G4SPZ · 27th Jul 2016, 10:34 pm

Great repair, Malcolm, well done!

Quote:

Originally Posted by Malcolm G6ANZ

...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.

So even equipment with surface-mount devices is now considered ancient, is it? I hadn't realised how old I was getting! But what a great response from the company. We used a Toa 'music on hold' unit in the 1990s and I seem to recall that it was very reliable.

Quote:

Originally Posted by Malcolm G6ANZ

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

Sorry but I can't seem to get either link to work; I get an error message and a blank page, but it could be my computer.

McMurdo · 27th Jul 2016, 10:49 pm

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

AC/HL · 27th Jul 2016, 11:58 pm

Nor me. Could you please upload then directly to the Forum.

Malcolm G6ANZ · 28th Jul 2016, 8:59 am

try these links:
The first shows the TX with the new crystal, the second the search coil and detector.
Malcolm

27th Jul 2016, 10:24 am	#1
Malcolm G6ANZ Octode Join Date: Feb 2006 Location: Bristol, UK. Posts: 1,042	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, 10:49 pm	#3
McMurdo Dekatron Join Date: Jun 2009 Location: Staffordshire Moorlands, UK. Posts: 5,271	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 __________________ Kevin

27th Jul 2016, 11:58 pm	#4
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Toa Radio mic Nor me. Could you please upload then directly to the Forum.

28th Jul 2016, 8:59 am	#5
Malcolm G6ANZ Octode Join Date: Feb 2006 Location: Bristol, UK. Posts: 1,042	Re: Toa Radio mic try these links: The first shows the TX with the new crystal, the second the search coil and detector. Malcolm Attached Thumbnails Last edited by AC/HL; 28th Jul 2016 at 12:55 pm. Reason: Images uploaded