Since the arrival of the Elma 4 pole 47 way switch, A47-SERB4-THT we can now provide the ultimate stereo ladder stepped attenuator. With 47 steps you will have serious control over your volume. We purchased the actual switches with the ladder in mind after several customers asked for it. Set with the challenge we got building once the switches arrived.
So with 184 resistors in total to fit across 4 PCBs with each pair of boards connected up there is a solder joint count of 376. As the PCBs are put through holes it is impossible to rectify a mistake so a board rebuild is required with each incorrectly soldered in resistors. Even with my experience I still manage to make mistake. For this reason we are only offering this stepped attenuator as built and tested. Build time is 4 hours so definitely not for the faint hearted. The actually switch is dismantled so as to give access to the PCBs, we do use the Cardas contact cleaner throughout the build to ensure no dirt or dust infects the contacts.
We have gone for the Takman 0.25W resistors, the larger 0.5W simply make the build almost impossible. So we have the carbon film and the metal films on offer. What is the difference? In my opinion the carbons offer a very natural sound, easy to listen to, not warm but not clinical either a good blend of the two characteristics. The metals offer a more crisp detailed sound.
If you compare the shunt version of this switch you will notice the much higher price of the ladder, mainly because of the construction, more resistors required and doubling the layer number of the switch too, plus more build time. Is it worth the extra expense? In my mind, yes it is. There is something effortless about a ladder switch in it's sound, this has to do with the constant impedance across the full sweep of the volume control. It is subtle but at the level of equipment this stepped is destined for, it is essential.
Impendance options: 10K, 20K, 50K, 100K and 250K.
The stepped is made up of the following parts:
- Elma 4 Pole 47 Way Switch
- 184 x 0.5W Takman Resistors (carbon film or metal film)
- 40cm of HGC 0.5mm diameter pure silver wire (earth ring x 2)
- 16cm of HGC 1mm diameter sheathed pure silver wire (signal input / signal output)
- Built using 4m of Mundorf 3.8% silver/gold solder
- Build time 4 hours - cost £120 (included in price)
BODY: width 45mm, depth 45mm, height 80mm
BUSH: diameter 10mm, height 10mm
SHAFT: diameter 6mm, height 15mm
The Elma SERB4 A47 can be used in conjunction with the Remote Control module, the Remote Audio PLUS with LIN Motor. For more information on this please click HERE
Price (1 off)
£503.74 +vat +p&p (with carbon film)
£516.62 +vat +p&p (with metal film)