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Old 21st September 2013, 02:21 PM   #1451
Salas is online now Salas  Greece
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BTW maybe 1N4148 diodes which are small current and very low capacitance can be best bet there for lifting the cathodes.
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Old 21st September 2013, 02:25 PM   #1452
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Nice that you repaired it Merlin. Well done. Can you hear the rough supply's hum or buzz at all or the circuit rejects it enough?
As you said the circuit rejects it enough
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Old 21st September 2013, 02:27 PM   #1453
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Salas if is not to ask too much could you suggest a 3rd stage to have moe gain, I'm very pleased with the SQ of Partridge 977 only that I need more gain.
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Old 21st September 2013, 02:36 PM   #1454
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BTW maybe 1N4148 diodes which are small current and very low capacitance can be best bet there for lifting the cathodes.
Next Monday I will ask to my local supplier, thanks for the trick.
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Old 21st September 2013, 02:47 PM   #1455
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Originally Posted by merlin el mago View Post
Salas if is not to ask too much could you suggest a 3rd stage to have moe gain, I'm very pleased with the SQ of Partridge 977 only that I need more gain.
Hmm it will reverse absolute polarity if its only one tube. If you will use an adapter for 6DJ8 / ECC88/ 6922/7308 in the second stage it will give +4dB over the 6SN7 without adding stages BTW.
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Old 21st September 2013, 02:53 PM   #1456
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Itch 42dB + 4dB ECC88 = 46dB + 15,6dB Partrdige 977 = 61dB, can be enough for 0,25mV DL103R?
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Old 21st September 2013, 02:56 PM   #1457
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I used 61dB before for that cart with DCB1 and 30dB amp and it was alright on 90dB+ speakers. But its subjective also about what you and me feels "loud" enough.
What impedance line input you drive now with the Itch? Maybe you lose some signal on low impedance volume pot line preamp also that 6SN7 can't drive strongly?
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Old 21st September 2013, 03:01 PM   #1458
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I use the Itch with:

-ECC81 mu-follower, 100k input pot (headphone amp for Sennhs HD600)
-#26 preamp, 100k input pot (lineamp)
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Old 21st September 2013, 03:13 PM   #1459
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No problem with loading the 6SN7 too much.
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Old 21st September 2013, 03:15 PM   #1460
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How can loading much the 6SN7: changing the pot for another with more ohms?

Have I to change something or simply buy a couple of adapters 6SN7-ECC88?
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