Copyright © 1998
Cadman Enterprises Ltd
Welcome to the Graham Slee Audio Products Owners Forum Open to all owners plus those contemplating the purchase of a Graham Slee HiFi System Components audio product and wishing to use this forum's loaner program: join here (Rules on posting can be found here) This website along with trade marks Graham Slee and HiFi System Components are owned by Cadman Enterprises Ltd |
Valve questions from a total numpty |
Post Reply | Page <1234 6> |
Author | |
morris_minor
Moderator Group Joined: 27 Mar 2012 Location: Surrey Status: Offline Points: 6017 |
Post Options
Thanks(0)
|
Thanks Graham.
BTW the tubes are Chinese 6n1 . . . I think any explanation of biasing will go right over my head . . .
|
|
Bob
Majestic DAC/pre-amp Accession MC/Enigma, Accession MM, Reflex M, Elevator EXP, Era Gold V Solo ULDE, Novo, Lautus USB and digital, Libran balanced, CuSat50 2 x Proprius + Spatia/Spatia Links |
|
Chris Firth
Moderator Group Joined: 16 May 2013 Location: Rossendale, UK Status: Offline Points: 1532 |
Post Options
Thanks(0)
|
The comment about capacitor discharge brings back memories of taking a guitar amplifier head in for repair.
The repair tech carefully removed the chassis from its cabinet and placed it upside down on the bench. He then picked up a very large and well insulated screwdriver, and contacted it on the legs of the large reservoir caps, which emitted a very loud crack on each cap. How loud was it? I nearly soiled my undergarments. The guy did explain to me that he had once started to work on an amplifier and he hadn't checked that the caps were discharged, and he got a belt off one of them that threw him against a stud wall. |
|
morris_minor
Moderator Group Joined: 27 Mar 2012 Location: Surrey Status: Offline Points: 6017 |
Post Options
Thanks(0)
|
This 1998 article from the IEEE is interesting . . .
|
|
Bob
Majestic DAC/pre-amp Accession MC/Enigma, Accession MM, Reflex M, Elevator EXP, Era Gold V Solo ULDE, Novo, Lautus USB and digital, Libran balanced, CuSat50 2 x Proprius + Spatia/Spatia Links |
|
Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
Post Options
Thanks(0)
|
Oh dear, another one taken away by the tube monster (only kidding... I hope ) The IEEE claims to be the World's Largest Professional Association For The Advancement Of Technology. I don't really claim anything but what I do is to try and find, tie down and overcome all the little things nobody else seems to want to talk about because it's not sexy. For example: parasitics which modulate the music signal and to be honest that's basically all I do. Pretty boring stuff to talk about and far from glamorous I know, and completely dead boring compared to glowing tubes. No way I could ever compete. Did I tell you about the little parasitic oscillations on the output of a linear voltage regulator and how different implementations can make a night and day difference to your music? Of course I didn't, because it's so utterly boring. Nuff said. Edited by Graham Slee - 03 Jan 2016 at 6:21pm |
|
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
|
|
Fatmangolf
Moderator Group Joined: 23 Dec 2009 Location: Middlesbrough Status: Offline Points: 8989 |
Post Options
Thanks(0)
|
I have several guitar amps with valves in them and they sound great when used as expected. thermionic valves/vacuum tubes don't last forever and yes they should be powered down when not in use, the warmed up through standby before use.
My knowledge of valves is from repairing and modifying guitar amps. The supply voltages are pretty high so dangerous and I use discharge resistors not screwdrivers to make the chassis safe to work on! |
|
Jon
Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
|
morris_minor
Moderator Group Joined: 27 Mar 2012 Location: Surrey Status: Offline Points: 6017 |
Post Options
Thanks(0)
|
You can breathe easy, Graham - I'd no more have a valve amp for quality listening than chose Bose speakers . . In my little bedroom system the amp comes downstream from a Novo, fed directly from a Raspberry Pi "squeezebox". The amp's only driving an old pair of Sony music system speakers anyway; it just makes a "pleasant noise" . . .
|
|
Bob
Majestic DAC/pre-amp Accession MC/Enigma, Accession MM, Reflex M, Elevator EXP, Era Gold V Solo ULDE, Novo, Lautus USB and digital, Libran balanced, CuSat50 2 x Proprius + Spatia/Spatia Links |
|
Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
Post Options
Thanks(0)
|
Of course it does Bob, just like "Cathode Ray" (RIP) explained it would in a very old issue of Wireless World. (https://en.wikipedia.org/wiki/M._G._Scroggie) |
|
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
|
|
Post Reply | Page <1234 6> |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |