Valves, Transistors, IC's and Components. Bench test techniques, Test Gear - Valve Testers, Scopes, CRT Testers, Bridges, Sig Gens, Pattern Gens, Workshop tours etc
- Posts: 70
- Joined: Sat Sep 20, 2014 6:59 pm
- Location: Bedford, UK.
I was shown one of these the other day. It is a double triode - operates on Va = 10 V, Vf = 0.7 V but behaves a bit like an ECC88.
I had no idea that such things existed.
- Posts: 294
- Joined: Mon Apr 23, 2012 6:42 pm
- Location: Witney, Oxon
It's fascinating but seriously low power- Pa max is 1.7mW. It also works in class A2 (positive grid bias) with an input resistance of about 200K.
It seems to be touted more as a "nice sounding distortion generator" than anything else. The characteristic curves look much like those for conventional triodes but at lower Va and much lower power.
- Posts: 340
- Joined: Tue May 01, 2012 11:23 am
It is an interesting "development"- but more prosaically, might reflect that VFDs (one of my favourite display technologies and one of the last outposts of thermionics!) are a diminishing market and teensy-weensy triodes represents a relatively low-risk toe-in-the-water in a market that craves "toob sound". It's obviously based on existing VFD fabrication techniques and experimenters have been exploiting the triode nature of the devices for a long time. I put development in parentheses as I can't help thinking it simply represents where battery valves would have been in about the early/mid 'sixties if the transistor hadn't appeared. Indeed, I suspect that tiny valves/thermionic ICs were on quite a few drawing boards and development labs on both sides of the Cold War but we just didn't get the full story.
- Posts: 2714
- Joined: Sun Sep 01, 2013 6:19 pm
- Location: Behind the sofa
turretslug wrote:It is an interesting "development"- but more prosaically, might reflect that VFDs (one of my favourite display technologies and one of the last outposts of thermionics!)
Snap! I love
VFDs - so elegant and attractive.
- Posts: 761
- Joined: Sat Jan 07, 2012 10:21 am
- Location: Sleaford lincs
Weird. I guess it's intended for some sort of guitar gear as it's made by Korg, maybe in a guitar pedal.
Never played about with VFD's. I intended to, having got one off an old video recorder, but I put it somewhere safe and havn't seen it since despite several searches.
Thanks for sharing John, I'll see if I can find anything more out.
- Posts: 730
- Joined: Fri Jul 29, 2011 10:16 pm
- Location: Coningsby, Lincolnshire
Not so long ago you could get a VFD from Maplins in a mixed bag of displays for £4.99. I think they may still have them, best to look in store rather than online as at least you get to pick the bag containing the display you want! I bought some to repair a VFD clock that I stupidly dropped and broke
Return to In The Workshop
Who is online
Users browsing this forum: No registered users and 3 guests