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Old 19th December 2011, 07:04 PM   #1
coldcut is offline coldcut  Sweden
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Default Pass amp paired with Lowthers

Hi all!

My Lowther build is soon finished and it's time to start deciding on a amplifier to go with it. Everybody I've asked so far yells "TUBES", but I always been a ss guy. I agree that tubeamps and Lowthers are a well proven match, but in this case I would like to try something different.

I had initially set my mind on a B1/F5 combo, but there might be even better solutions? The source is mainly vinyl, and a htpc with a Lynx card.

Speakers are BLH with Lowther C45 8Ohm.

Thanks/John
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Old 19th December 2011, 07:16 PM   #2
Baumi is offline Baumi  Germany
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Try current sources...F1,F2,original zen without feedback.
I drive Lowther opus1 BLH and fostex fe206 with modified zen-amplifier(current source)
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Old 19th December 2011, 07:19 PM   #3
Murdoc is offline Murdoc  Germany
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Hi!
You could look for forum's user Jon Ver Halen and his comments on the various Pass First Watt Models. This will be quite interesting for you, I guess!
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Old 19th December 2011, 07:45 PM   #4
coldcut is offline coldcut  Sweden
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That is what I call a quick reply! Thanks, guys!

I will read up on the F1 impressions to start with..

BTW, are these circuits considered to be open for public use? What about the availability of pcb cards regarding the earlier FW amps? Are they still possible to purchase? Or, where are the pcb layouts to be found if I need to make My own?

/John
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Old 19th December 2011, 08:09 PM   #5
Zen Mod is offline Zen Mod  Serbia
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go to FIRST WATT , look for products

most of them have dedicated threads here in Papaland ; look for shortest titles
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Old 19th December 2011, 08:22 PM   #6
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Also look at the Zen Variations 9 w/o feedback or modulated current source (AKA figure 4) ....
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Old 20th December 2011, 07:04 PM   #7
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Quote:
I will read up on the F1 impressions to start with..
6moons.com has reviewed several First Watt Amps, if not all of them and a prototype.
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Old 20th December 2011, 08:56 PM   #8
Bigun is offline Bigun  Canada
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My experience with full range drivers is limited to Fostex (and a little Mark Audio) and my experience has been poor with SS and much better with tubes. The SS gear I've tried has all been global negative feedback stuff - i.e. high damping factor. It's widely touted that high damping factors are not idea for this type of speaker. I tried a series resistor at the amplifier output, but this did not produce good results. My tube amp is much better and has no feedback. The F5 uses feedback whereas some of the lower numbered First Watt Amps do not.
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Old 21st December 2011, 06:21 PM   #9
coldcut is offline coldcut  Sweden
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So.. If my Lowthers are 8ohms, what should the output impedance from the amp be to get optimal damping numbers?
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Old 21st December 2011, 06:49 PM   #10
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http://passdiy.com/pdf/cs-amps-speakers.pdf
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