If you need a low-priced decoder to convert your older Marklin locos for digital operation you've got to buy from the sources available.
TAMS is one and the PD 101 from Hobby-Eberhardt is another. ESU make a low-priced one one as well but it doesn't have the same functionality.
You don't need to replace the field coil with a magnet so the cost of the decoder + delivery + installation is the only cost involved.
Don't forget that both decoders allow your locos to function as analogue
or digital locos (but note the warning about the use of blue transformers above) and you will get excellent reversing with these decoders in either mode of operation.
Find out more about the PD-101 here:
(http://www.pd101.com/e/pages/impressum.asp )
Technical data (copied from site)
- maximum for motor 700mA
- adjustable acceleration and breaking delay
- adjustable starting / middle / maximum tension for
speed control- 3 functions with max. 100 – 350mA on Märklin* 6021 or
Intellibox. Maximum for each function is 100 mA , it may
increase up to 350 mA if total on the decoder is not more
than 1000 mA.
- function: lights in driving direction
- F1: light in opposite direction
- F2: free for individual use (Telex, Smoker)
- F3 acceleration/breaking delay off/on
- Signal stop with adjustable breaking delay
- Direct programming without opening of the loco with
Märklin 6021 or Intellibox.- For use on analog AC or DC systems is no special
programming necessary.
- Same size as Märklin Delta decoder (35 x 20 mm).
- Replaces exactly the mechanical (reversing) switch of the Märklin loco.
21 Euros each and you are buying from the manufacturer (as with TAMS).
The running characteristics are excellent - I have had more experience with the PD 101.
As for installing them: You need to have a steady hand and a hot soldering iron and you need to clean the commutator slots before you install the decoder.
Good luck and I hope you post your experiences here.