Recreated TR-7 / R-7 Service Kit
HISTORY - Several years
I purchased a TR-7 and wanting to be able to work on it obtained a copy
of the Service Manual. I soon learned to do any serious work a Service Kit sold by DRAKE
20 - 25 years ago as an option was required. These kits nowdays are essentially unavailable.
In a year of looking the only one I saw sold was on E-Bay going for $320. I started exploring
the possibility of making my own by asking what the design was like and collecting parts.
As others learned of my project several asked to be included until I determined a small lot
might be produced.
The biggest problem I have had is finding parts. The printed
circuit cards were
professionally designed and supplied. But the various connectors used by Drake were
by MOLEX who only sells in very large quanties. I was lucky and found several
components which had been setting in the ware house back rooms for years.
Over 75 kits have been supplied with very positive feedback
the total cost is $64.80. In the EU countries air letter postage is $8.90 USD
making the total $68.90 USD. My Payapl ID is firstname.lastname@example.org
If interested or have questions I may be contacted by e-mail at:
or by phone at  750-7589.
These images are provided for informational purposes for the Drake community.
Here is the complete inventory of the components that made up the DRAKE service kit and those items supplied in my recreated kit:
13 extender boards, made up from the 5
3 each 3 pin Extender Cards
2 each 4 pin Extender Cards
2 each 5 pin Extender Cards [Bold - Supplied in My Recreated Service kit]
4 each 6 pin Extender Cards
2 each 9 pin Extender Cards
1 DIGITAL JUMPER board, as shown above
3 tuning tools (standard diddle sticks) [Not Supplied]
1 sheet of instructions, [Not Supplied] that reads in its entirety:
"The original TR-7 Service Kit consists of 13 extender
a jumper board, and
three tuning tools to facilitate the repair and maintenance of the R.L. Drake
"The extender boards are used to elevate printed circuit boards above
compartments to provide access to each side of the circuit board for
troubleshooting. Since some circuit boards use more pins than the longest
extender board, it will be necessary to assemble several extender boards to
accommodate all of the circuit board pins.
"The jumper board connects the TR-7 translator board and the digital
board together. The jumper board is required in TR-7's that have a DR-7
installed, and it allows the TR-7 to operate after the DR-7 has been removed.
The DR-7 must be removed to gain access to the front half of the TR-7.
Three tuning tools are provided so that adjustments can be made to variable
resistors, capacitors, and inductors in the TR-7. Refer to the TR-7 Service
Manual for all adjustments and technical maintenance."
There is some discussion about the CARD PULLER supplied by DRAKE. I believe it came with those units that had the Digital Readout [DR-7] card which was sold as option.
I do not supply the CARD PULLER with my recreated service kit as it is easy to facricate from a small length of heavy wire.
From the bench of Gary Poland, W8PU, one of my TR-7 Service Kits in use. Notice how several size extender cards are used in combination to elevate a TR-7 card from its normal card cage location.
Also notice the Digital Jumper Card being used so the TR-7 will operate as the DR-7 Digital Desplay board has been removed.
Other Drake Links:
R.L. Drake Virtual Museum
R.L. Drake Company Home Page
Gary W8PU TR-7 Web Pages
Ron WB4HFN TR-7 Web Pages
Jim's Shorney's Page on TR-7 Extender Cards