Search found 61 matches
- Sat Sep 22, 2012 11:21 pm
- Forum: Sim City
- Topic: 842 Triode Spice
- Replies: 7
- Views: 8158
- Fri Sep 21, 2012 4:34 pm
- Forum: Sim City
- Topic: 842 Triode Spice
- Replies: 7
- Views: 8158
- Thu Sep 20, 2012 10:27 pm
- Forum: Sim City
- Topic: 842 Triode Spice
- Replies: 7
- Views: 8158
- Thu Sep 13, 2012 6:22 pm
- Forum: Sim City
- Topic: 842 Triode Spice
- Replies: 7
- Views: 8158
842 Triode Spice
Hi all! I came across a very interestingly looking triode
from the 800-family: 842
*Moderate Ra @ 2.5k
*12W dissipation (or more if someone wants steroid KR tube version)
..anyone has a Spice model? The usual suspect Stephie ?
Thanks!
-j
from the 800-family: 842
*Moderate Ra @ 2.5k
*12W dissipation (or more if someone wants steroid KR tube version)
..anyone has a Spice model? The usual suspect Stephie ?
Thanks!
-j
- Thu Sep 06, 2012 12:00 am
- Forum: Phono
- Topic: Switching of the phono inputs
- Replies: 11
- Views: 14981
Finally, after some crawling through the hughe Blowtoch thread on diyaudio.com:
http://www.diyaudio.com/forums/solid-st ... -1570.html
I'll experiment with a big shallco switch from nebraska surplus:
http://www.surplussales.com/Switches/SWRotaryAll-1.html
http://www.diyaudio.com/forums/solid-st ... -1570.html
I'll experiment with a big shallco switch from nebraska surplus:
http://www.surplussales.com/Switches/SWRotaryAll-1.html
- Mon Sep 03, 2012 11:41 am
- Forum: Phono
- Topic: Switching of the phono inputs
- Replies: 11
- Views: 14981
Continuing my search, I came across TKD 2R6A switch: http://www.tkd-corp.com/pdf/p05_2r6a.pdf Solid silver, less than 5mOhm resistance (for comparison Hg-wetted relays are about 50mOhm), fully enclosed...not bad! ...and whooping 200Eu + shipping/pcs :O Which actually given the price of Hg-wetted rel...
- Fri Aug 31, 2012 1:45 pm
- Forum: Phono
- Topic: Switching of the phono inputs
- Replies: 11
- Views: 14981
I've found a detailed pic of the EMT JPA-66 innards http://audio16.wordpress.com/tag/emt-jpa-66/ It seems there are using Takamisawa A12W-K relays for switching (also I guess the signal: the relays below SUT's seem the same) Golden contacts--ok, 50mR but at 1A, ...ok but not imressive. No ida if the...
- Tue Aug 28, 2012 10:35 pm
- Forum: Phono
- Topic: Heaters for Phono stages - questions.
- Replies: 5
- Views: 10107
I pre-het the tubes for 2mins before switching the HT. This is done with a time realy in HT PS transformer primary: the relay is driven by the heater voltage, taken at the firs LC cell. What I have recently observed is that the heater voltage drops a bit after switching of the HT supply on: from 13....
- Tue Aug 28, 2012 9:28 pm
- Forum: Phono
- Topic: Switching of the phono inputs
- Replies: 11
- Views: 14981
Here is one more specimen:
http://www.torontosurplus.com/midland-r ... 00014.html
Interesting that it's supposedly latching...but getting any datasheet seems impossible
http://www.torontosurplus.com/midland-r ... 00014.html
Interesting that it's supposedly latching...but getting any datasheet seems impossible
- Tue Aug 28, 2012 6:44 pm
- Forum: Phono
- Topic: Switching of the phono inputs
- Replies: 11
- Views: 14981
Is it not possible to find a few examples of these relays NOS or loan from others, to test, instead of spending big bucks ? I'm trying, with little success so far--neither Rhopoint nor few other replied. I understand that Hg-wtted would be hard to get in EU due to some idiotic fantasies of EU burea...
- Mon Aug 27, 2012 6:29 pm
- Forum: Phono
- Topic: Switching of the phono inputs
- Replies: 11
- Views: 14981
Thank you Island! This is just an idea, which may as well be a no-go. Everything depends on how much I get quoted for those toys to be able to experiment. I got a quote for 50GB5N...630$/pcs (!!!!)...maybe ok for a Gulfstream Jet, but I recon too much even for an Allnic H3000...speaking of the later...
- Mon Aug 27, 2012 1:51 pm
- Forum: Phono
- Topic: Switching of the phono inputs
- Replies: 11
- Views: 14981
There is also this military toy: 50GB5N-1-A700 which I've found through diyaudio: http://www.jogis-roehrenbude.de/Verstaerker/6C33C-VV.htm Hard to get any reasonable datasheet, not written in the military language. There is a whle family 5GB5N. It seems to be hermetical, Hg-wetted and not a reed: th...
- Sun Aug 26, 2012 3:07 pm
- Forum: Phono
- Topic: Switching of the phono inputs
- Replies: 11
- Views: 14981
Thanks Dave! I've never seen anything more advanced than a mechanical switch at the phono input. If anyone has any experience with thermocouple relays, I'd be interested to learn. I've contacted Rhopoint, since Hg-wet are not standard. Let's see what they quote... BTW, how do you guys deal with mult...
- Sun Aug 26, 2012 10:44 am
- Forum: Phono
- Topic: Switching of the phono inputs
- Replies: 11
- Views: 14981
Switching of the phono inputs
Hi all! I don't know if the topic has already been discussed (if so apologies for not searching hard enough :): how to switch phono inputs? For some time I've been chewing on the idea of using Hg-wetted thermocouple reed relays. They are supposed to be designed for switching microvolt signals, gener...
- Sun Aug 26, 2012 10:19 am
- Forum: Phono
- Topic: Heaters for Phono stages - questions.
- Replies: 5
- Views: 10107
Andy, in my heavy Pussy EAR834 clone, I use a huge choke input (0.3H/1A) supply with SiC diodes, followed by another LC cell, then RC and finally LT317A-based CCS for each individual tube, decoupled with a tiny wima plastic cap at the socket. The supply is overblown perhaps for heaters, but the same...
In pentode mode 6E5P 3.5 volt bias. I changed the resistance of L1 to 3.32k. This puts the grid of the GU81 at -89 volts. 6E5P total current =27mA, 5 watts (23+4mA) Gu81 at 1600v, 267mA=450 watts. Changed primary ind to 130H, 1 ohm load from 32.5mH. 2v peak in produces equal 2nd and 3rd harmonics a...
In pentode mode 6E5P 3.5 volt bias. I changed the resistance of L1 to 3.32k. This puts the grid of the GU81 at -89 volts. 6E5P total current =27mA, 5 watts (23+4mA) Hmmm...my motivation was that in the triode mode, run hard to eventually supply a bit of a grid current, 6E5P would give a more linear...
That might make it more linear, I'm seeing a couple hundred watts even in pentode mode before things get too out of hand. I adjusted biasing slightly on your circuit. Do a DC analysis first, before the transient analysis. Hmm...I thought I've done it. What operating point do you get? And what load?...
Ultralinear?
I'm wondering if there would be a way to put into the ultralinear mode?
The problem is 1kV difference between the G2 and the plate...
Cheers,
jarek
The problem is 1kV difference between the G2 and the plate...
Cheers,
jarek
It seems that it just wants to clip...the bias was always negative but the cut-off is ugly. I've followed your instructions, below is the FFT for 20Hz @ 1.4Vrms with 2x less load set at 2k. It gives only 90+W, which makes it unattractive as big triodes like 833 can do that too. And without so much d...
There is a discussion on Romy's site about a powerfull >100W SET amp to drive a dedicated bass channel 50-100Hz max. Romy has imposed a series of constraints, e.g.: 2 stage design, no IT coupling, no parallel drivers, no cathode followers, pref. DC coupled, etc etc. Since I have some heavy HV iron I...
Stephie, I was thinking of it in a pentode mode rather, G2 can handle only 600V max. The goal is a powerfull, 150W+ single ended electric chair...eeee....bass amplifier. The point I was looking at is 1500V/300mA 3.2k load. Would be interesting to see how non-linear it is and how it matters given the...
GU81M
I've figured out 833A would be to weak to electro-cute well enough, even in A2, but GU81M, pentode mode, should do the job. Anyone (Stephie :):):)?) would have a model: A1 + the onset of A2, G1 and G2, G2 at 500V I've tried contacting this Italiano: http://www.diegobarone.it/ModelloGU81.htm but to n...
- Sat Apr 09, 2011 3:56 am
- Forum: Sim City
- Topic: 833A model
- Replies: 3
- Views: 6207
- Thu Mar 31, 2011 1:43 pm
- Forum: Sim City
- Topic: 833A model
- Replies: 3
- Views: 6207
833A model
Ok, that's serious---does anybody have a spice model for 833A,
correctly reproducing both A1 and A2 curves?
Thanks!
jk
correctly reproducing both A1 and A2 curves?
Thanks!
jk
- Thu Mar 31, 2011 1:40 pm
- Forum: Phono
- Topic: BIG nano core SUT challenge
- Replies: 2
- Views: 6120
- Wed Mar 09, 2011 4:06 pm
- Forum: Sim City
- Topic: 6336B model
- Replies: 6
- Views: 9039