atmasphere
Responses from atmasphere
| AR SP8 mk2 high output volume AR output stage circuit diagram. https://ibb.co/Chrcx4tOMG- while you are at it, jumper out R-30, C25 and C26. This will allow the feedback to include everything that occurs at the output of the preamp. I would also consider eliminating the C24 by... | |
| What tube amp for Harbeth 40.1 I watch that video, it is interesting. But I have a question. Is it really the speaker drawing power? I don’t think the speakers draw power, but it is the amp pushing power, right? I have a question. if we play the same music, volume knob a... | |
| Is idler drive better than belt drive or direct drive? By the way - tapes have massive droppoff in high frequency over time, not to mention bleed through ( from layer to layer ). I used to import Reference recordings - talk to Keith Johnson about tape quality, there is no decent tape made any more ... | |
| AR SP8 mk2 high output volume Good to know the A30 volume pot does not degrade the signal when set lower than full. I learned something. @audite84 The volume control is a 100K device. Combined with the input capacitance of the voltage amplifier tubes (which are essentially 6S... | |
| Line Stage Preamplifiers AX vs AU ^^ Yes- once you hear what they do its hard to go back to miniature tubes. | |
| What tube amp for Harbeth 40.1 No tube amp is likely to have the same dramatic bass punch as a powerful SS amp will. That's not why people buy tube amps.These days most solid state amps have output impedances so low that they overdamp the loudspeaker; no speaker made needs more... | |
| Cartridge Opinions - Sorry @mijostyn That 92 degree SRA thing is an approximation- an average. Any LP will actually be slightly different. Hard to know how much of it you'll actually hear. | |
| What tube amp for Harbeth 40.1 Tested on my Spatial Audio X5, the 8W one sounds more dynamic. Naturally- SETs make distortion in such a way that the distortion sounds like 'dynamics' to our ears. But I get your point- we have a lot of Harbeth owners as customers and somehow the... | |
| AR SP8 mk2 high output volume Quite often George and I disagree, but not here. @mrdecibel This 'integrated' amp does not employ a separate gain stage for a preamp section. Its a power amp circuit (a variant of the Williamson circuit) and simply has enough gain that any source... | |
| Line Stage Preamplifiers AX vs AU I was told that a 12BH7 can be used as a replacement for a 12AU7. Is that true? I've read notes about this compare, So I boughta bunch of 12BH7's, and none stood up to Tele 12AU7 as far as sonics, sound stage etc. As I mentioned above, there a... | |
| AR SP8 mk2 high output volume when I put the AR I notice a plus in terms of presence and forcefulness of the musicOK. I asked simply because with a high level signal like a CD player I would not have expected adding additional circuitry would have helped out. | |
| Line Stage Preamplifiers AX vs AU @yogiboy Yes, but you have to deal with the filament wiring, as the 12BH7 has a 12V center-tapped filament similar to a 12AU7. The 6CG7 can only be operated with 6.3V filament voltage. But the rest of the pin basing of the two tubes is the same, ... | |
| Is idler drive better than belt drive or direct drive? When he changes from TT to Tape, you don’t want him to go back to TT!@mglik If the LP was not a direct to disk then this is very easy to see. Of course a lot depends on what was used for playback of the LP in the example. | |
| Line Stage Preamplifiers AX vs AU @mozartfan You might want to hear what a 6SN7 does for a line stage. The 12AU7 is based on the 6SN7. Actually the 6CG7 is a 6SN7 in a miniature envelope, and the 12AU7 is the same geometry as the 6CG7 but with half the plate area. | |
| AR SP8 mk2 high output volume @tenoris Having looked at the schematic supplied by @imhififan I agree that essentially this amplifier is actually a power amplifier supplied with three inputs and a passive volume control. Since the control is 100K and given the characteristics o... |