Adrian, There are two boards that are commonly found with a TR-7. One is the board needed to operate the rig when the DR-7 digital display board is removed for testing or alignment. It is labeled C3990W and is shown here: http://incolor.inetnebr.com/jshorney/tr7ext.htm
The other is the board which is removed when the NB-7 noise blanker is installed. Early rigs shipped without the NB-7. The later TR-7A included the NB-7 board. The NB-7 board itself is shown here: http://www.dproducts.be/Drake_Museum/images/NB7color.jpg Good luck, -Tom On Sat, Dec 12, 2009 at 3:27 AM, Adrian Rees (MW1LCR) <ree...@btconnect.com>wrote: > Hello everyone > > Thank you all for your replies, both on and off list. > > I'll start by stripping & cleaning the PC Board connectors, as per the many > suggestions I received. > > Over here in the UK, we have a product called Servisol, which I guess is > the > same as your Dexoit. Both switch & contact cleaners. > > The guy I bought the TR7 from had started restoring the radio and had > changed two transistors, before stopping work on it. These were two > transistors are in the power supply section, specifically Q2104 and Q2105 > (TIP31). > > He had also acquired two spare boards for the radio, an IF Switching board > and what appears to be a interstage RF amplifier, identified by the serial > C3988W on the board. > > I'll clean the connectors and see what we have got then. > > Since it's a week or two before Christmas, and we live up in the hills, the > XYL wants to go shopping, so its doubtful I'll achieve much on it today, > although I may have time this evening, between contacts in the UBA Low Band > contest which is on tonight & tomorrow morning.(I'm running my rebuilt > FT102 > & Dentron Linear for a bit of nostalgia !) > > Best wishes & many thanks ! > > Adrian MW1LCR > > North Wales. > > > > _______________________________________________ > Drakelist mailing list > Drakelist@zerobeat.net > http://mailman.zerobeat.net/mailman/listinfo/drakelist >
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