After my previous positive experiences with silver transformers and silver LCR RIAA coils, I ordered a set of silver transformers from Lundahl for some cost no object all silver power amplifiers.
A pair of silver LL1691BAg/70mA, the silver version of the LL1691B which has proven to work well in 211 amplifiers.
These will be used along with LL2746Ag interstage transformers, the silver version of Lundahls relatively new LL2746.
These transformers are on a larger core as Lundahls other interstage transformers, suitable for a serious driver tube which will be another 211 in this case. The tubes which will be used in this amp will be 2 ELROG ER211 per channel. To make the silver theme complete the amp will use silver wiring throughout, including tubes with silver wiring in the base. Of course the amp will use an equally suited input transformer, the LL7903Ag. Here a photo of the transformer set of one channel:
The LL1691BAg transformers are big blobs of silver, here in comparison with the LL1660Ag, which works nicely in a silver line stage which I built earlier this year.
Stay tuned for posts about this cost no object amplifier. I will also write another detailed post about the Elrog tubes which will be used.
Besides this rather high power amplifiers I also plan a 45 amp at the other end of the power spectrum. Since the 45 has proven to work well as driver for the 45 as described here, it will be 45/45. Using the LL2746/30mA which fits well for this application. This is the transformer set for the 45 amp:
It will use the LL1682Ag, a silver version of the LL1682:
As can be seen in the photos, these silver transformers finally come with much better quality solder terminals:
Sturdy solder lugs are used on fiber glass boards. Smaller lugs for the interstage transformers and primaries of the output transformers:
The solder lugs for the speaker connections of the output transformers need larger lugs with a center hole of sufficient diameter for the thicker silver wire used in the output windings:
Some detailed shots of the wires coming out of the winding stacks, here the LL1682Ag:
The output transformer for the 211:
The primary connections of the 211 transformer:
Some samples of the enamelled silver wire which is used:
Stay tuned for updates on these exciting new projects!