johnsonwu
Responses from johnsonwu
| Thoughts on Audio Research D70 I have a batch of 0.1, 0.22, and 0.47 FT3s laying around.Cant use them anywhere other than my point to point wired projects. Too big.All my Vcaps are deployed in various pcs of existing gear.Are yours branded ones or generic Russian? Definitely no... | |
| What so special about Sonic Frontiers ? For tube amps, its all about the following:Placement of coupling caps so it doesnt become a microphone for the high currents supplying the filaments.Careful attention to grounding and floating certain parts. and a good startup circuit that warms u... | |
| Thoughts on Audio Research D70 @DaveyF: It's AOK... to each his own.I am writing this echoing my opinion which concur with that of many others, esp on the more DIY oriented forums.Perhaps too many people who posted similar opinions have metal dome or ribbon tweeters that need s... | |
| Thoughts on Audio Research D70 @Smoffat: The reason why I sold my CL120 (and CL150 of course) was the solid state input and gain stages. I believe in the Counterpoint (Michael Elliot) philosophy of getting the small signal stage as tubey and transparent as possible and use what... | |
| Thoughts on Audio Research D70 @Daveyf: I meant even after replacing the Rel+Wonders with the class B caps like Auricaps there is still glare remaining. Not so this time, I am using oil caps, not polyprop.My 2 main pairs of speakers are Avalon Eidolons (too big for my 14 x 18is... | |
| Thoughts on Audio Research D70 My experience with stock vintage Audio Research gear is that all of them distort/smears quite early with complex passages esp. chorale and loud piano chords.I also have a problem with constantly trying to adjust the volume when listening to music.... | |
| Thoughts on Audio Research D70 @Hifigeek1: Those huge lytics are Sprague and Mallory and hard to find in-stock @ Digikey or Allied. The cap plugs are impossible to buy in qty < 1000. | |
| Thoughts on Audio Research D70 @Sbrown: Check VHAudio V-cap's web page on sizing coupling caps. The -3dB rolloff point is lower than audible. Plus there is hardly over 2 inches of traces from plate to grid for each coupling stage.Also even in the 90s when I used to call Leonard... | |
| Thoughts on Audio Research D70 Sovtek and Svetlana tubes are definitely good value for the money. I have owned no less than 8 Audio Research amps and I have only 1 tube blow out on me since I never run the bias rich. 50-55mA instead of pushing 65.There are other ways to get ric... | |
| Thoughts on Audio Research D70 @sbrown if you are just after the sound of the kt120 and not the marginal increase in power you can use just 4 tubes in your 115. That's how I sometimes run my old vt130 anyway. Make sure you are using one tube per phase per channel. Filament supp... | |
| Thoughts on Audio Research D70 I wouldn't put 8 kt120s into it. Consider how much more current the filaments will draw. 8 kt88s in tetrode mode should be able to power the hungriest of hogs. The apparent lack of power is from the stock caps. If you are not comfortable with DIY ... | |
| Thoughts on Audio Research D70 all measured OK. Thanks HifiGeek1 for the pointers.Took me 2 hours to carefully pull all the wondercaps and Relcap coupling caps out, and another 2 hours almost to install k40y9s into the amp (size and metal casing does NOT help at all).The foggy ... | |
| Thoughts on Audio Research D70 Hmm I think I found it, goes from ground to pin4 of TL071, big 7W WW resistor. 26.4k and holding stable no change with tapping. | |
| Thoughts on Audio Research D70 @Hifigeek1 you are talking about the 270k drop resistor R75 thats a protection bleeder across the main B+ filters right? I cant seem to find a 27k in the schematic. Is that a WW or a Carbon comp? | |
| Thoughts on Audio Research D70 @DaveyF: No other offender. I am comparing it with my 6 other amps in the room.Vac Phi 70 monosCounterpoint NP220 Premium goldJolida 502 thats "re" modified from an already modified unitjust to name a few.@hifigeek1: Thanks a lot for the suggestio... |