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Read the Post in new Window Read the Post in Threaded view  Post #4: The 150V regulators. by Romy the Cat on 2005-08-22 
Browse the content of the threads in new Window  Thread: Gas voltage reference 0A2 tubes. in Melquiades Amplifier  42 Replies 
[quote user="guy sergeant"]When I worked for a UK based tube amp manufacturer some 10 years ago we had a couple of pre-amps using OA2's in shunt regulator circuits. These (physically shorter than standard) OA2's came from Richardson and did work very...

Read the Post in new Window Read the Post in Threaded view  Post #241: Shunt regulation by AlexBerger on 2013-02-17 
Browse the content of the threads in new Window  Thread: The last phonocorrector: “End of Life" Phonostage in Analog Playback  311 Replies 
Does anybody try to change shunt regulators OA2 to 15K Ohm resistor?I heard from number of people that OA2 is too noisy for phonostage.For example, in this article wrote about this http://www.audionote.co.uk/articles/tweak_ai_p2_phono_mod_0...

Read the Post in new Window Read the Post in Threaded view  Post #1: Inside views of "melquiades" by AnonymousUser on 2006-01-10 
Browse the content of the threads in new Window  Thread: Inside views of "melquiades" in Melquiades Amplifier  1 Replies 
hi-i have downloaded the circuit diagram for your amp but wondered if you have any photos of the "guts" so i can see how you laid yours out ?just a couple of questions1- R3 + R24-27 are shown not in bold print-why ?2-it says "look below for OPT"-?3-a...

Read the Post in new Window Read the Post in Threaded view  Post #1: Gas voltage reference 0A2 tubes. by Romy the Cat on 2005-08-21 
Browse the content of the threads in new Window  Thread: Gas voltage reference 0A2 tubes. in Melquiades Amplifier  42 Replies 
Would anybody recognize who manufactured those 0A2 regulators? Since I use them quite aggressively, I picked at MIT's fleamarket a few dozens of them dirt-cheap. The tube looked suspensions. Then marked as Amperex, Made in England and National Elect...

Read the Post in new Window Read the Post in Threaded view  Post #2: Re: inside views of "melquiades" by Romy the Cat on 2006-01-10 
Browse the content of the threads in new Window  Thread: Inside views of "melquiades" in Melquiades Amplifier  1 Replies 
[quote user="AnonymousUser"]hi-i have downloaded the circuit diagram for your amp but wondered if you have any photos of the "guts" so i can see how you laid yours out ? [/quote] I do not have a full rage Milq anymore. I have only the 3-chanals Supe...

Read the Post in new Window Read the Post in Threaded view  Post #18: Shielding the gas stabilizer? by Romy the Cat on 2005-09-09 
Browse the content of the threads in new Window  Thread: Gas voltage reference 0A2 tubes. in Melquiades Amplifier  42 Replies 
[quote user="Jack 14"]To sum up, it seems that if you want a stable VR tube, you should age it a few hundred hours and shield it against magnetic fields. Is it making any sense to you ?[/quote]Interesting, Jack. I have two old-school quite experience...

Read the Post in new Window Read the Post in Threaded view  Post #242: Application dependent by N-set on 2013-02-17 
Browse the content of the threads in new Window  Thread: The last phonocorrector: “End of Life" Phonostage in Analog Playback  311 Replies 
[quote user="AlexBerger"] I heard from number of people that OA2 is too noisy for phonostage.For example, in this article wrote about this http://www.audionote.co.uk/articles/tweak_ai_p2_phono_mod_01.shtml [/quote]Those type of statemen...

Read the Post in new Window Read the Post in Threaded view  Post #38: New Jersey, what exit? by floobydust on 2009-01-19 
Browse the content of the threads in new Window  Thread: Gas voltage reference 0A2 tubes. in Melquiades Amplifier  42 Replies 
Hi all, Just joined the cat house... funny seeing the mention of some old stomping grounds here... like Bendix in Red Bank, NJ... they were one of my accounts back in the late 70's. As some of you may know, the U.S. Army's electronics center was...

Read the Post in new Window Read the Post in Threaded view  Post #8: Driver tubes by Chirag on 2005-12-03 
Browse the content of the threads in new Window  Thread: Headphone amplifiers. Baby Melquiades? in Melquiades Amplifier  27 Replies 
[quote user="Romy the Cat"]Hey, Chirag, long time no see. [/quote]Hi Kitty,I always try to see whats going on on this site, but by the end of the day I'm usually too bloody tired to think clearly enough to write something of interest.  This week...

Read the Post in new Window Read the Post in Threaded view  Post #1: Bias help by cb on 2007-10-09 
Browse the content of the threads in new Window  Thread: Bias help in Melquiades Amplifier  96 Replies 
Hi Romy I have a mono completed full range Melquiades and another only with the bias circuit hooked-up. The bias voltage I get on the 6e5p is around minus 4.4v on both the circuits. This is with the inputs shorted. With the inputs connected to adj...

Read the Post in new Window Read the Post in Threaded view  Post #3: RE: Bias help by Romy the Cat on 2007-10-09 
Browse the content of the threads in new Window  Thread: Bias help in Melquiades Amplifier  96 Replies 
[quote user="cb"] The bias voltage I get on the 6e5p is around minus 4.4v on both the circuits. This is with the inputs shorted. With the inputs connected to adjust voltage to 0.0mvdc, I get a reading of plus 0.4vdc. This is with VR1 set at maximum (...
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