Found something plausible. H1 has mic/line 2kOhm input, H2 has dedicated line 10kOhm input. I would expect around 400 Ohm Zout from the 6SN7 Mu follower upper tier output point that the Itch utilizes. Guess why I missed ''sparkle'' in the H1 recordings, when it was OK on the stacked Quads through Aikido to Fran, and also OK to my PC on H2 last track. Another mystery solved by your trusty Hot For Valves!
oooh, good work!
Just for others not tuned in.... the earlier recording was using a zoom H1 which I had borrowed from a friend. The second is using a zoom H2. I had intended buying a zoom H1 (for on-camera use with a shock mount) but then very luckily found a H2 2ndhand locally. To say these would be like hens teeth is putting it mildly.
Seems like I lucked out!
Anyway, we could do with some more builders around here. This must be one of the best sounding phonostages around today. An object of desire for anyone with a TT, whether using MM or MC carts.
Fran
Just for others not tuned in.... the earlier recording was using a zoom H1 which I had borrowed from a friend. The second is using a zoom H2. I had intended buying a zoom H1 (for on-camera use with a shock mount) but then very luckily found a H2 2ndhand locally. To say these would be like hens teeth is putting it mildly.
Seems like I lucked out!
Anyway, we could do with some more builders around here. This must be one of the best sounding phonostages around today. An object of desire for anyone with a TT, whether using MM or MC carts.
Fran
I would like to make a bid here for the record for the longest time to build an itch. I started in January and have still not got to first switch on. Anyway so far it's going well thanks to Salas and the crew on this thread! I am sure you would all laugh at my current spaghetti wired version which once tested will then be rebuilt inside it's much tidier boxes. I must get some pics posted for the record. Anyway thanks for help so far.
Its not easy to get it totally non humming if not certain building techniques have been followed as you saw earlier with Fran's build. Any high gain low level input circuit for that matter, especially HV. But the test build will be good to check if it is connected up right circuit wise, if it biases well, that there is signal, nothing blows etc. Waiting for pics then. Good luck firing it up.
Here is the initial hash up, not finished yet so not quite ready for firing up. With some rather long wire runs necessary at this stage I expect I may get a bit of hum....
I have one box ready, need to make second. Might have gone overboard with the box build with old oak floorboards dovetailed for that built like a tank look.
I have one box ready, need to make second. Might have gone overboard with the box build with old oak floorboards dovetailed for that built like a tank look.
An externally hosted image should be here but it was not working when we last tested it.
I believe if the cap is simetric (parallel stacked foils like the rectangular Wimas) it does not matter.
If the cap is cilindrical type, probably with an outer foil, you should take that in consideration and find it.... outer foil should be connected to the lowest impedance side of the circuit (gnd or output of the stage)
If the cap is cilindrical type, probably with an outer foil, you should take that in consideration and find it.... outer foil should be connected to the lowest impedance side of the circuit (gnd or output of the stage)
I just bought:
1578=6SN7=TOP RUSSIAN 6N8S Tube FOTON MATCHED PAIR 60s
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Russian 6N2P-EV (ECC83 12AX7) MATCHED PAIR Tubes NOS
1578=6SN7=TOP RUSSIAN 6N8S Tube FOTON MATCHED PAIR 60s
Russian 6N2P-EV (ECC83 12AX7) MATCHED PAIR Tubes NOS
An externally hosted image should be here but it was not working when we last tested it.
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