News: Trouble logging in? Log in from the login page.
September 20, 2017, 10:29:49 pm

Author Topic: Another tube rolling option?  (Read 175 times)

0 Members and 1 Guest are viewing this topic.

Offline Bonzo

  • Full Member
  • ***
  • Posts: 212
  • My name is Marco, best known as Bonzo
    • View Profile
Another tube rolling option?
« on: July 14, 2017, 09:14:34 pm »
Ciao!
I've just stumble upon an ebay auction of Russian NOS 2P1P tubes.
Very cheap, and they say they are DL92 substitute (even if they are beam tetrode, but maybe once triode strapped...).
The datasheet looks promising and seem are pin-to-pin compatible:
http://www.radiomuseum.org/tubes/tube_2p1p.html

Here's the link to the sale (no affiliation with the seller):
http://www.ebay.com/itm/1x-2P1P-Audiophile-Direct-Heated-Beam-Tetrode-Tube-1F33-DL92-1T4T-NOS-Tested-/322555560011?hash=item4b19cf404b:g:wosAAOSw3v5YoiiD

PS: I've also spotted an ad for Telefunken 3S4 at €4,99 a piece from ebay Germany! Hurry up!
Bisogna avere orecchio!

Offline Caucasian Blackplate

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 8227
    • View Profile
Re: Another tube rolling option?
« Reply #1 on: July 15, 2017, 06:32:53 am »
The 2P1P specs a maximum filament voltage of 1.4V.  A fresh D-cell battery is 1.57V.  I don't know if this will matter in practice, but I'd maybe buy a pair or two and see how well they last.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Bonzo

  • Full Member
  • ***
  • Posts: 212
  • My name is Marco, best known as Bonzo
    • View Profile
Re: Another tube rolling option?
« Reply #2 on: July 15, 2017, 06:58:46 am »
I bought a pair for now.
Let's see how they perform, maybe they could be a cheap option for people who use rechargable batteries.

Anyway: still amused by the kit after all these years  8)
Bisogna avere orecchio!

Offline mcandmar

  • Hero Member
  • *****
  • Posts: 1466
  • Not all engineers are civil
    • View Profile
Re: Another tube rolling option?
« Reply #3 on: July 15, 2017, 07:15:05 am »
I bought a set too, but never got around to trying them  :-[

I did try these which i liked http://bottlehead.com/smf/index.php?topic=6098.msg59146#msg59146
M.McCandless

Offline Bonzo

  • Full Member
  • ***
  • Posts: 212
  • My name is Marco, best known as Bonzo
    • View Profile
Re: Another tube rolling option?
« Reply #4 on: July 15, 2017, 07:34:04 am »
I bought a set too, but never got around to trying them  :-[

I did try these which i liked http://bottlehead.com/smf/index.php?topic=6098.msg59146#msg59146

Yes, still I have mine, but too lazy to put the switch for the heater to try them...
Bisogna avere orecchio!