|New (and improved!) Argonaut Circuit Boards in the works. -- I am starting to approach small business and manufacturers in order to
see if it is possible to have some newer and improved updated circuit boards made up for the Ten Tec Argonaut 505 and 509.
----> The existing boards are quite primitive by todays standards and the 505 circuitry is compatible with the 509 so that..a 509 board
will generally work as a pin for pin drop in replacement..in most instances.
---> The first two boards Im going to try and get built are the Control Board (to replace the 505 control board with hard to get reed
relay) and secondly: the audio board which in the 505 uses old hard to get germanium transistors that is failure prone.
|How about starting with the Final PA stage. The Argonaut 515 final Amplifier (RF output transmit) is pin for pin
compatible with the Argonaut 509 RF final output stage. The 515 stage is an improvement with greater power output that ranges to around 8 watts or even 9
watts in some cases with a pair of 2SC2075 (MRF476s). The board itself is not all that complex..and I have some extra 2SC2075s I bought from Dans Small Parts
a while back-- so Im thinking I will try to approach FAR CIRCUITS in USA to get an estimate on the cost of making some "knock offs"of the 515 board. I may even
approach Ten Tec and see if they will supply new boards.
Im hoping the new circuit boards will be "modern"type boards with crisp circuit lines and etching. Something like the nice boards I have gotten lately from
W8DIZ the qrp kits and parts person USA.
I don't think Ten Tec will mind me doing this. The Argonaut 505, 509 and 515 series was manufactured over 30 years ago and is long since out of production. I
only plan on making up a small amount of boards ..say 10 to 20 at the most. As is my usual practice here with this little hobby type business..I will be marking up
the boards about 20 pct as a tiny slim profit (helps pay for my ham hobby in my retirement).
|BELOW; I did a bending exercise on the leads of the 2SC2075 when trying to replace some
transistors on a 509 board. I did not install the emmitter lead resistors (see the 515 schematic
here on this page). The transistors got red hot even with a respectable home made heatsink.
|So..this fall/winter of 2012/2013..I will be trying to get made some 515 Argonaut Final PA boards for use in the older 509 Argonauts. So..if you are
interested..email me and I can guage how much interest there would be in this project.
I'm going to write FAR Circuits and send them along a sketch of the Argonaut 515 final board and the 509 audio board and see how much Far
Circuits will charge for doing the boards.
I don't have a huge budget with my pension here..so I will likely only order something like 10 to 20 boards total. If you would be interested in the
new boards..just drop me an email at my address: email@example.com (note: I no longer live in Clayton Ontario but have moved to Elliot
Lake, Ontario. I just kept the old email address alive.
|The OTHER BOARD..I want to get manufactured is a 509 Audio board (uses an IC) to replace the 505 audio boards which use germanium
transistors. The 505 audio boards seem to get damaged fairly often and the germanium transistors are not always easy to get..so a new
audio board will also be in the works in the fall and winter of 2012/2013.
|This page under
CONSTRUCTION ..last worked on 27 August 2012. I will be doing this new Argonaut circuit boards project this
winter..and ..maybe..I will expand it so that I will have more brand new boards for the Argonaut. Who knows??
73 earl ve3ab
|Later on..down the road..I would like to make available argonaut 515 circuit
boards for the RF final output stage.
|Updated this page: Dec 1st 2012