allenwright
Responses from allenwright
| I need a lower gain 12au7 for Mastersound There is no "lower gain" 12AU7. There are tubes with less gain but nothing that can just be swopped over without major wiring changes inside = very good technician = $$$.La Scala's are way more efficient than the current norm, but can sound great.... | |
| A phono amp that beats the MFA Magus's phono? I build the JLTi phono, which someone recommended - way better than the EAR in my opinion.But I disagree with the advice about loading your MC cart with between 100 and 500 ohms - that will just suck the life out of it. Loading down a MC is a very... | |
| Number of tubes in Pure Class A amps I see no reference to Class A operation. Zero NFB does NOT imply Class A operation, they are two very different things.And if it was pure ClassA, then the power consuption would need to be MUCH higher than 145 watts. As I said, 4 times as much as ... | |
| Best Balanced Tube Preamplifier The *best* balanced tube preamp is the Vacuum State RTP3D - but it does not have "tuby" colourations - nor does it have SS colourations.Regards, Allen | |
| "Matisse" preamp - 12AX7 12AT7 There is absolutely NO danger in swopping the tubes you have mentioned. You will not damage anything, and 9 times out of 10 it will run OK, and give you the gain lowereing you desire.But it may not sound as good as it would if the stage had been d... | |
| Soulution 710 Amplifier and 720 Preamplifier I have heard the Solutions in the Munich HiEnd show, and to me they sounded nothing special - just another high powered, high negative feedback solid state design. For $80k I'm sure you can get gear that is far more musical, and have enough left o... | |
| MC Load Resistance I know personally five top line cartridge makers, and when quizzed on this question, they all confided to me that they themselves, use 47k. loading.When asked why they then recommend much lower values in their instructions, they all said it was be... | |
| Power Amp Doubling Output at 4 Ohm 1/ Realise that this concept ONLY applies to solid state amps - a tube amp delivers it's maximum power into the rated impedance, and less as the impedance climbs or drops.2/ If the SS amp is well designed, with a decent sized powersupply and enoug... | |
| Which tube balanced preamp good for modding? A number of very keen enthusiasts have taken the Atma-Sphere balanced preaamp and modified it with circuit sections from my RTP3C/D circuit with great results.You can find the schematic of the RTP3D on my site and info on the mods on the Atma-Sphe... | |
| Tube Pwr Amp Speaker impedance matching Yes you can, and if they are really the impedance you believe them to be, it should work fine.But ESL panels are seldom one actual impedance, often very high at low frequencies and falling to very low at high frequencies. So maybe it will work bes... | |
| Do failing tubes give off burning smell? Tubes do not smell even if seriously overheated.But their associated parts can burn and that's what you've been smelling.I would be very doubtful about just replacing the suspect bad tube, it's very possible something else is the cause of the lack... | |
| Mapletree Ultra 4A SE - mods My key policy in 35 years of amplifier design is KISS - keep it simple sweetheart.Removing a potentiometer from the signal path is a help towards that and could result in a noticeable improvement - depending on the quality of the pot - and very fe... | |
| Number of tubes in Pure Class A amps >>So Ayon may indeed be accurate in saying that it is Pure Class A, both in Triode and Pentode? But the 4 tubes only seems a stretch?<<Can't say unless you give me the exact reference of the data on the Ayon gear you refer to. I'm good... | |
| Number of tubes in Pure Class A amps >>Is the power output ability in pure Class A not a linear function of number of tubes?<<It should be, but there are several "classes" of Class A.Pure Class A1 in triode has an efficency of 25% output power compared to the actual heat ... | |
| Seeking suggestions for Preamp FPlanner, I may be new here, but I was asked a specific question and was answering it by refering the asker to some links. I don't consider that advertising.If I'm breaking forum rules, can you please tell me which ones?Regards, Allen (Vacuum State) |