alexberger
Responses from alexberger
| 300b lovers Hi @donsachs , Yes Dave Geren at Cinemag do great job! I use Hashimoto A-305 IT between 6f6 (driver) and 300B. The square wave was almost perfect at 10KHz, 20KHz, 30KHz. I use an 80K Ohm grid resistor on 300B. But I’m not sure this resistor is n... | |
| 300b lovers I have a technical question for tube gurus @lynn_olson @donsachs @atmasphere I put the intrastage transformer Hashimoto A-107 between the 6sn7 input and 6f6 driver tubes in my SET amplifier. The load resistor connected to the 6f6 grid was 520KOh... | |
| 300b lovers Hi @lynn_olson @donsachs What is changed in sound with the driver replacement from 6v6 to kt88? On the one hand kt88 is much more powerful and low output impedance tube. On the other hand 6v6 is more linear. Did you try kt66 that is more li... | |
| ALTEC MAGNIFICENTS.....MODIFICATIONS Hi @autospec , You can use these link as crossover capacitors guide: https://www.humblehomemadehifi.com/Cap.html | |
| Amplifier Pairing with Coherent 15s I heard Coherent 18 in Montreal show. They sound very easy and dynamic. In term of dynamics they more similar to old Altecs or Tannoy Silver and Gold from 50x-60x than to modern Tannoys. Coherent 15 should work well with Aric Audio Super 300B, ... | |
| 300b lovers Hi @lynn_olson , Thank you for the detailed lecture about tubes! Here is Shishido version with 300B. No DC on secondary of IT. 300B is in a regular cathode bias. http://www.vestnikara.spb.ru/vestn/n4/shishido1.gif What do you think about SRPP ... | |
| 300b lovers Hi @atmasphere , I meant that tube with less internal impedance with a transformer load with the same inductance has wider bandwidth in bass. I agree unfortunately 5687s OTOH. | |
| 300b lovers Here is an example of direct coupling: http://www.single-ended.com/Lagarto/shishido/811A.png Is 6f6 grid load easy enough for SRPP? ECC82 can be changed for 6sn7. What do you think about this schematic? | |
| 300b lovers Hi @donsachs , I have two questions about your new amplifier: 1. When you decided to go to an interstage transformer after the input stage, why did you stay with 6sn7 and didn't move to something like 5687? With 5687 you can get even wider band... | |
| Resolving CD Transports Crowd Sourcing It is interesting how is a new Schiit Urd compared to Jay Audio, Teac VRDS 701T and Project RS2T transports. | |
| 300b lovers Hi @lynn_olson , According to your comparison between RC coupling and IT coupling, IT coupling between input and driver stage should increase slew rate (dynamics, trancients, speed) similar as it does between driver and output stage. Isn't it? On... | |
| ALTEC MAGNIFICENTS.....MODIFICATIONS I have Altec 604E since 2005. Two year ago, I built crossovers based on original n1500 schematics using good quality modern parts. The difference in sound is huge. It is like different, much more expensive speakers. The chokes in the original cr... | |
| 300b lovers Hi @donsachs , Will you present your new amplifier in the Montreal Audio Show in March? | |
| 300b lovers Hi @donsachs, Lynn told in this thread that you prefer schottky diode in your amplifiers. Why do you prefer schottky over other diodes? Hi @lynn_olson , As DIY I can adjust my amplifier to my own taste preference. But compared to experience... | |
| 300b lovers Hi Lynn, In my SET amplifier is IT coupling between driver and 300b and RC between an input and a driver stages. I think I understand why the tone issue appeared. I played with driver tube B+ voltage and current. The cathode resistors 680 ... |