Hi Dave,
If I remember correctly the reason for the 125 ohm connectors was because that was the impedance of the vertical deflection plates. The input signal went directly to the plates. So I would guess the answer is no - there was no other use for 125 ohm connectors
To get 125 ohm characteristic impedance the size of the inner conductor has to be different than for a 50 ohm characteristic impedance so Tek made special 50 ohm to 125 ohm adapters. The 50 ohm GR 874 connector was on one end and the 125 ohm GR connector was at the other end. The 50 ohm end was the standard color of all GR connectors. The 125 ohm end was plated with gold. Because of the gold they were quite eye catching and "unique". The entire set of adapters Tek made for the 519 came in a really beautiful mahogany box. I had one of those boxes with most of the 519 adapters. The box, the adapters, and the 519 are now in Barrie Gilbert's collection of scopes.
Dennis Tillman W7PF
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-----Original Message-----
From:
[email protected] [mailto:
[email protected]] On Behalf Of Dave Seiter
Sent: Monday, August 12, 2019 9:03 AM
Speaking of the 874 connectors, were the 125 ohm versions ever used for anything unrelated to the 519s, or by anyone outside of Tek?
-Dave
On Sunday, August 11, 2019, 05:12:44 PM PDT, Dale H. Cook <bridgewaterma@...> wrote:
On 8/11/2019 4:08 PM, Bruce Hunter wrote:
The 774-series connectors were the predecessors of the 874-type and best described as a banana plug encased with an outer shield. They were not hermaphroditic.
--
Dennis Tillman W7PF
TekScopes Moderator
