RE: Where's My Thumbs-Up Button? (nt)

Posted by ivan_terrible (P) on July 2, 2024 at 08:52:07

In Reply to: Where's My Thumbs-Up Button? (nt) posted by Triode_Kingdom on July 2, 2024 at 02:14:15:

Thumbs up/down....
ha, you wanna see the stuff I found on the DB110 thread and more!

It's the case, that under test, very few amplifiers actually deliver the claimed performance - these being from so called "golden era".

I rest my case against all the scamming going on for both the amps and the valves.
The amps typically always deliver about HALF the claimed output with double the claimed distortion - particularly IMD.

I wouldn't like to imagine anything from PRC or modern RU production....

When I buy brand new NOS stock supposedly "pure gold"(made in England).
The production spread was enormous.

eg.Out of 250 NOS pentodes, I get static idle currents varying from 50-150% and these were GEC best ever.
Making matched pairs is real mess.

Same from STC MIL SPEC beam tetrodes. 2 of them arced over at startup.
Out of 15 NOS I could just about make a matched quad, with 2 rejects.
oh well!

here's a good NOS one that worked sitting next to it's perfect 70yr old JAN friend from the 40s.
The 254m has a smaller top cap so alu foil has to make up the size diff.

Here of course was another (EBAY) numpty who sold me this DOA KT8.

When I ran the other 4, (supposedly new but not) the ceramic had expanded and torn the wires out of the base pins, requiring total dismantlement, resoldering etc to stop the constant intermittent contacts taking place.
(drove me crazy for my 250 quid spent!)

'nuff said eh?

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Follow Ups Full Thread

Topic - The most expensive 12AX7s - TFK, Mullard, GEC..... - andy evans 08:57:53 07/01/24 (13)

RE: The most expensive 12AX7s - TFK, Mullard, GEC..... - ivan_terrible 22:30:22 07/02/24 (2)

RE: The most expensive 12AX7s - TFK, Mullard, GEC..... - Triode_Kingdom 00:17:40 07/03/24 (1)

RE: The most expensive 12AX7s - TFK, Mullard, GEC..... - ivan_terrible 00:45:54 07/03/24 (0)

RE: The most expensive 12AX7s - TFK, Mullard, GEC..... - Jim McShane 14:08:31 07/02/24 (5)

Scarcity = High Pricing... Swedish Standard 33S29B - opalize 13:30:55 07/03/24 (0)

Ah....GECs are scarce..... - andy evans 02:43:36 07/03/24 (0)

RE: The most expensive 12AX7s - TFK, Mullard, GEC..... - ivan_terrible 00:54:16 07/03/24 (2)

Bangy-Bang - Byrd69 15:44:05 07/03/24 (1)

RE: Bangy-Bang - Triode_Kingdom 19:07:32 07/03/24 (0)

RE: The most expensive 12AX7s - TFK, Mullard, GEC..... - ivan_terrible 01:10:03 07/02/24 (3)

Where's My Thumbs-Up Button? (nt) - Triode_Kingdom 02:14:15 07/02/24 (2)

RE: Where's My Thumbs-Up Button? (nt) - ivan_terrible 08:52:07 07/02/24 (1)

Yep, Been There - Triode_Kingdom 14:56:00 07/02/24 (0)

Follow Ups

RE: Where's My Thumbs-Up Button? (nt) - ivan_terrible 08:52:07 07/02/24 (1)

Yep, Been There - Triode_Kingdom 14:56:00 07/02/24 (0)

RE: Where's My Thumbs-Up Button? (nt)

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