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Low Voltage Valve/Tube Buffers/Hybrids/Amps |
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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My Junior's teacher once brought in some batteries for us to experiment with. One was a 90V HT battery!!!
I accidentally shorted it with some thin bare wire which instantly glowed and burnt in two. It also discharged it... Luckily I avoided the cane. |
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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BAK
Senior Member Joined: 14 Mar 2010 Location: Kentucky, USA Status: Offline Points: 1744 |
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Have I got my A B C s mixed up? Isn't that where we got "B+" to mean the high voltage power supply? ... 90 volt HT battery was called the "B" battery, as I recall. An "A" cell was the grid bias battery? A "C" cell was the filament ? Edited by BAK - 27 Jan 2016 at 3:32pm |
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Bruce
AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way! |
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DaveG
Senior Member Joined: 26 Oct 2014 Location: London Status: Offline Points: 481 |
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Ha! if it happened these days it's more likely Injurylawyersrus would be encouraging the parents to sue the skool for scaring little Graham |
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Dave
Michell Gorbe + HR PSU -> Cadenza Bronze -> SME V -> Elevator -> Accession -> Proprius -> B&W CM6 s2 | Cusat 50 & Spatia cables -> |
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Fatmangolf
Moderator Group Joined: 23 Dec 2009 Location: Middlesbrough Status: Offline Points: 8998 |
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Indeed! If we could just get all the injury lawyers to visit each other's offices, fall over and sue each other... perpetual inflation.
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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. |
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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Sounds right to me. |
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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US Patent 5450034 looks interesting and reached its 20 years last September, so it will be turning up in all sorts of valve hybrids soon (if not already).
http://www.google.co.uk/patents/US5450034 It's called a Reflected Plate Amplifier and is very similar to the two transistor stage used in many a transistor preamp circuit. It suggests the use of one half of a twin triode, but the other half couldn't be used for the second channel (because of crosstalk) and would be wasted. It gave me the idea to try making a differential input stage which would use both halves and traditional negative feedback could be applied in a more predictable manner (I do so hate wasting time and components on "what if's"). At least the invention could make use of the same plate voltage used in a class-a 90V HT supply circuit using just 45 volts for its supply, as there is no conventional plate (anode) load. Therefore the valve's designed characteristics would be met. I will try and draw up the basic circuit and present it here, and if it succeeds you never know, the stage could be offered as a kit... We'll see. |
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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Just an idea...
It may work Edited by Graham Slee - 28 Jan 2016 at 2:06am |
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