johnsonwu
Responses from johnsonwu
| Triode mode vs pento mode Thanks for the info. What do you think of the amps that allow for a switch between UL and triode? Are they somewhat "compromised" for the sake of flexibility?I understand your designs tend to avoid transformers completely and I had the pleasure of... | |
| Triode mode vs pento mode Hi Ralph, what about pentode amps like an audio research d115 which is regulated screen grid not UL?Are those trannies not good for triode too? | |
| CounterPoint SA3000 Repair Technician Originally it was Mike and Dai. Then Mike and Bob (RIP Bob). | |
| Cayin A-100T KT88 tube spec Sigh... Your guy does not know how to perform resistor change. He only knows how to snip and solder resistors. Get someone who knows the principle of power tube biasing. Read up a few pages on the Internet. | |
| Counterpoint 5.1- Beyond My Comprehension Bigkidz the 5.1 is pure tube rectifier and regulator contrary to whats written on AltaVista. The 3.1 is solid state.I think even the voltage reference uses a gas tube. | |
| Triode mode vs pento mode I am guessing the less resolution in triode mode that Dover mentioned only occurs when the triode switched amp is playing a rather loud and complex passage.Based on my limited experience, to get the best out of a triode amp you really need a very ... | |
| Counterpoint 5.1- Beyond My Comprehension The 5.1 is good as it is as long as it's stable. I wouldnt sink money into it unless there is some sentimental value.There's really nothing special to a dual 6922 grounded cathode parallel plate-drive line stage. An SA5000 with the followers pulle... | |
| Counterpoint 5.1- Beyond My Comprehension I have done upgrades to SA1000, 2000, 3000, and limited stuff on the 5000 which is very hard to work on.The SA5.1 schematic is floating around the Internet and the official one available from Catherine Weber per Altavista. Both Bigkidz and I have ... | |
| Counterpoint 5.1- Beyond My Comprehension The 6CA4 inthe SA5.1 is the rectifier (note: not regulator) for the high voltage B+ of the SA5.1.It converts AC to some 500V of DC that goes into the regulator.If the B+ going into the regulator has low voltage, then obviously gain will be diminis... | |
| Tube upgrades for Jolida 502B? Fear not TomTab. Not only do I have KT120s on my 502B I even have ECC99s replacing the wimpy 12AT7s (of course the driver stage is completely rebiased for ECC99 operating point). I am running a lot more heater current on this thing and the power s... | |
| Tube pre, SS amp incompatibility, which amp 2 use? Output caps are leaking DC if they pop when connected to SS amp. Change them out with high voltage rated ones like mundorf and you will have no problem. | |
| Counterpoint - Alta Vista - Mike Elliott Buy service manuals / schematics from Catherine Weber per the website. I bought mine. | |
| Focal Utopia Micro BE setup help If you are unsure then simply wire the speakers deliberately out of phase with one speaker having the + and - swapped. Listen to a mono recording and see if the sound is all over the room. | |
| Conrad Johnson Premier 140 6922 tube swapping OP I assume your unit is stock. Given its vintage I think money is much better spent on checking out the caps and resistors and tubes in the gain and driver stage before you risk any $ going into the hands of the too many scammers selling those so... | |
| Coconut Audio = LOL Any relation to machina dynamica or Dakiom? |