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  #11  
Old 7th February 2017, 02:33 PM
bob orbell bob orbell is offline
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Default Re: Klp1

Andy, I have loads here if you give me your address, I will post a couple. BOB
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  #12  
Old 7th February 2017, 03:21 PM
westiebj westiebj is offline
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Default Re: Klp1

Hi .. Thanks

With regards to any noise due to proximity of PSU to Phono I can say I can detect none

Even turning the wick right up all I get is valve hiss .. and thats only if I put my ear to the tweeter .. and I'm pretty sure is the main amp

Having said that I have recently installed a copper screen between the two halves. ( for a feel good factor ) :-)
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  #13  
Old 7th February 2017, 06:02 PM
bikerhifinut bikerhifinut is offline
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Default Re: Klp1

Well it won't do any harm!
Sorry I didn't mean to infer that your project suffered from hum from the transformer so apologies are due to you there.

I'll still be using an offboard PSU, mainly because I already have a very good one with regulated HT so it makes sense for me to go that route.

for a very neat and smart bit of kit.

A.
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  #14  
Old 7th February 2017, 08:05 PM
JohnG JohnG is offline
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Default Re: Klp1

Thank you for your support
It is feeling like a Pre 3 with off board power supply is top of the shortlist.
WD's have done me proud in the Past, so I can't see any reason for that not to continue.
I will investigate other projects based on this build.

John
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  #15  
Old 8th February 2017, 10:37 AM
Richard Richard is offline
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Default Re: Klp1

Did you find out what sensitivity your new power amps will be John?
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  #16  
Old 8th February 2017, 08:27 PM
JohnG JohnG is offline
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Default Re: Klp1

I will chase up the sensitivity of the monoblocks from the engineer.
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  #17  
Old 9th February 2017, 06:46 PM
JohnG JohnG is offline
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Default Re: Klp1

Hi, I have spoke with engineer, he will need to revisit design notes to give a accurate answer.
He has included a potentiometer on the mono blocks, this will allow a CD to be reduced in volume if to loud, or another component increased, if in need of it.
He thinks the KLP1, is OK for it, but will benefit from a improved power supply especially the capacitors.
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  #18  
Old 9th February 2017, 07:45 PM
bob orbell bob orbell is offline
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Default Re: Klp1

Hi John, the best improvement to your KLP1 is to chuck it in the bin, no, joking aside, as you may have read, I put one together from bits some time back, and I think that you could improve it by using DC on the heaters, and may be a new power supply using full wave rectification with inductor capacitor smoothing, as an alternative, have you ever considered a passive pre?. BOB
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  #19  
Old 9th February 2017, 08:57 PM
Richard Richard is offline
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Default Re: Klp1

Hi John,

Some modern CD discs are produced at a higher level but most result in a similar line level to Phono amps, Tuner, Tape etc. CD machines are often quoted as 2V but that is for a recording at full modulation and most are nowhere near. Hence around 500mV sensitivity of a power amp is needed for line level from most sources inc CD players and you'll often find modern amps quoting around 300mV.

So, if your power amps have that sensitivity a vol control may be useful but really the vol control is better in the pre-amp as you'll need one to select sources anyway.

My concern is that a lot of older power amp designs needed a couple of volts for full output and hence an active pre. See what the sensitivity is then you can decide a route
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  #20  
Old 9th February 2017, 09:07 PM
JohnG JohnG is offline
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Default Re: Klp1

Hi Bob
I have no intention of permanently partnering the KLP1 with the 845's.
It is not to be binned but relegated, or maybe reassigned.
The engineer built this preamp for me and was talking from his recollection of the design. The preamp can stay a partner to the K5881-MK1 as this was where it was originally intended to be, even though a short lived model soon replaced by the KLPP1.
I have thought about different preamp types and will be looking forward to learning more about their differences and contribution to a musical experience.
I am assuming their are many a great debate and deliberation about the Less component in a signal path preamp vs Line Stage Preamp.
I will be doing a few auditions to see how I experience the different models.
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