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Old 17th September 2008, 04:58 AM   #121
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Do they sound nice?
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Old 17th September 2008, 05:15 AM   #122
Salas is offline Salas  Greece
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Nice. Have to listen more to tell you their exact traits.
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Old 23rd September 2008, 03:30 AM   #123
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Salas,

I'm going to make it drive the Pass Lab F4 power amp. Can you tell what kind of gain ( db ) it can provide?

Thanks
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Old 23rd September 2008, 03:47 AM   #124
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15dB or times 5.6
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Old 23rd September 2008, 05:12 AM   #125
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Thanks
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Old 28th September 2008, 05:04 AM   #126
Salas is offline Salas  Greece
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With a 1V P-P input and about 6V P-P output (volume control at max), this is the distortion it charts. Only second harmonic above the grass. 3rd etc are missing in action. Also, otherwise much possible 50 & 100 Hz hum peaks, are missing in action too with the regulator used.
At half the volume rotation, it gives 0.07% THD and 0.051% IMD. I am not sure if the percentages are right or actually lower (I used an IBM Thinkpad which loops 0.05% by itself), but the shapes are correct.
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Old 21st October 2008, 02:48 PM   #127
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Salas,

I've collected all parts I'll need for the project with 2 very nice nos philips 6v6.
I'd like to make use of all other parts I have in hand. 350-0-350 120ma tranny, cv378, 32H choke and couple 100uf Elna Cerafine and 50k 25w breeder but don't know if the tranny is too big?

Albert
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Old 21st October 2008, 05:11 PM   #128
Salas is offline Salas  Greece
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Looks like too big for voltage. But there are always resistors to calculate voltage drops to suit. Keep in mind that all you need is a 340V, clean B+ under load. There are many different ways to skin a cat.
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Old 27th October 2008, 02:46 PM   #129
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I'm looking for another tranny for this pre, 300-0-300 sounds more suitable.
Have you ever thought of making it a balanced pre?
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Old 27th October 2008, 05:58 PM   #130
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Yes, its more suitable.

No, I haven't tried to make a balanced pre. My best source is my humble TT with Denon DL-160 through my Jfet Riaa design. Its single ended. But my Benchmark DAC-1 has balanced outputs too, and I can always design a new Riaa which accepts the cartridge balanced for current amplification...hmm don't put new ideas to me. I just finish my experiments on cascoding my Jfet RIAA...
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