Pass amp paired with Lowthers

coldcut · 19th December 2011, 07:04 PM

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

Baumi · 19th December 2011, 07:16 PM

Try current sources...F1,F2,original zen without feedback.
I drive Lowther opus1 BLH and fostex fe206 with modified zen-amplifier(current source)

Murdoc · 19th December 2011, 07:19 PM

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!

coldcut · 19th December 2011, 07:45 PM

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

Zen Mod · 19th December 2011, 08:09 PM

go to FIRST WATT , look for products

most of them have dedicated threads here in Papaland ; look for shortest titles

Roscoe Primrose · 19th December 2011, 08:22 PM

Also look at the Zen Variations 9 w/o feedback or modulated current source (AKA figure 4) ....

vdi_nenna · 20th December 2011, 07:04 PM

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.

Bigun · 20th December 2011, 08:56 PM

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.

coldcut · 21st December 2011, 06:21 PM

So.. If my Lowthers are 8ohms, what should the output impedance from the amp be to get optimal damping numbers?

Roscoe Primrose · 21st December 2011, 06:49 PM

http://passdiy.com/pdf/cs-amps-speakers.pdf

19th December 2011, 07:04 PM	#1
coldcut diyAudio Member Join Date: Aug 2008	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

19th December 2011, 08:09 PM	#5
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	go to FIRST WATT , look for products most of them have dedicated threads here in Papaland ; look for shortest titles __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

20th December 2011, 08:56 PM	#8
Bigun diyAudio Member Join Date: Jan 2009 Location: K-W Ontario Blog Entries: 2	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. __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

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19th December 2011, 07:16 PM	#2
Baumi diyAudio Member Join Date: Oct 2004	Try current sources...F1,F2,original zen without feedback. I drive Lowther opus1 BLH and fostex fe206 with modified zen-amplifier(current source)

19th December 2011, 07:19 PM	#3
Murdoc diyAudio Member Join Date: Nov 2010 Location: Paderborn	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!

19th December 2011, 07:45 PM	#4
coldcut diyAudio Member Join Date: Aug 2008	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

19th December 2011, 08:22 PM	#6
Roscoe Primrose Do you smell smoke? diyAudio Member Join Date: Jan 2004 Location: Virginia, USA	Also look at the Zen Variations 9 w/o feedback or modulated current source (AKA figure 4) ....

21st December 2011, 06:21 PM	#9
coldcut diyAudio Member Join Date: Aug 2008	So.. If my Lowthers are 8ohms, what should the output impedance from the amp be to get optimal damping numbers?

21st December 2011, 06:49 PM	#10
Roscoe Primrose Do you smell smoke? diyAudio Member Join Date: Jan 2004 Location: Virginia, USA	http://passdiy.com/pdf/cs-amps-speakers.pdf

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