AD1 - Complete set of NOS NIB tubes for build a finest Single ended amplifier
For my most cherished project to build a finest Single ended amplifier I was getting and collecting these very hard to find tubes, but now for a financial doldrums I am forced to sell.
The tube set or lot to selling consists of:
2 x 4683 / AD1 Philips Miniwatt NOS, same factory codes: 4C FBC, absolutely news, never used, only for the full tested strong in the AVO 160 tube tester. The 4683 is the strong AD1 version.
2 x AF7 Philips Miniwatt, absolutely news, never used, sealed prior to the actual photos,
Beautiful tubes, ideal driver for AD!.
2 x C3m Siemens, NOS NIB, never used, excellent tube driver for AD1 SET amplifier.
2 x AZ1 Philips Miniwatt full wave rectifier. nice with AD1 SET
2 x AX50 Triotron full wave rectifier, NOS NIB, nice for AD! SET amplifier.
The total price is for the 10 tubes.
The AD1 is famed German triode output tube of the 1930's, can be considered the final and best development of DHT, and at the same time this tube closes the period of Triodes.
Unlike tubes like 45, 2A3, and 300B not a great quantity of AD1 were made.
After the war, the AD1 was an expensive tube and the answer to that was using indirectly pentodes. These were tubes like AL4, which is at the beginning of the evolutionary tree, ending with EL34.
AD1 is in the list of top-10 most sought after DHT tubes today and the most favorite DHT tubes in Japan, Yamamoto and Kurashima use this tube in their current SET amplifiers.
Any question is welcome and will be quick response.
BTW I have the PSU with power transformer from the Telefunken 686WK, legendary radio 1937.