I need headphone amp. Lehmann?

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thyristor44

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Joined 2013
#1
Hello
I need a headphone amp to run from the take off from my quad 34 preamp.
Has anyone any experience of this h##p://www.ebay.co.uk/itm/2017-New-TT650-HiFi-Headphone-Amplifier-Kit-Ref-LEHMANN-Headphone-Amp-DIY.

Or Headphone amplifier board reference lehmann circuit design Board Reference Lehmann circuit design Kit AC 15V—0—15V
Thanks
thyristor44
 
#8
scottjoplin said:
Do you mean 405? I'd be tempted to use a divider network on the speaker outputs
Click to expand...
Yes it is a 405-2.
If I use a divider network on the speaker outputs that would mean the speakers are working. I need them to be silent and the phones on.
The quad 34 has a line level audio out playing whatever the preamp has selected. If the volume control is turned to zero the speakers are quiet. It seems a pity not to use that.
 
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#10
True, but you could switch them out, ie, take the outputs to a switch that toggles between the speakers and a divider network for your headphones. In most amplifiers with a headphone socket the speakers are automatically disconnected when the headphone plug is inserted
 
#11
scottjoplin said:
True, but you could switch them out, ie, take the outputs to a switch that toggles between the speakers and a divider network for your headphones. In most amplifiers with a headphone socket the speakers are automatically disconnected when the headphone plug is inserted
Click to expand...
Headphones are usually plugged in to preamp so only line level audio is switched. If I put a switch on the speakers it would have to switch 100 watts rms at 15 ohms is about 3 amps quite a lot.
Apart from the fact that so much fuss is made of speaker cables cant imagine what would be said about a switch effecting quality.
 
#16
thyristor44 said:
Thats interesting, the clones are about £100 here.
Click to expand...

A few thoughts:
You can often get those 'kits' in fully assembled form for not much extra money. If it doesn't work, you can't be blamed for the problem.

I can rationalize buying a 'clone' if 'the real thing' is grossly overpriced, and if the clone doesn't look like a 'forgery'. A Lehmann clone with the Lehmann name and logo on the front panel is something I wouldn't buy.

My personal opinion is that there's a lot more variability between headphones ('quality') than between headphone amps, so you'll probably be satisfied with any amp that will drive your headphones. Some HP amps are cheap enough that they are in the 'play' category.

There are quite a few DIY options as well - are you interested in that sort of project?
 
#17
An externally hosted image should be here but it was not working when we last tested it.
( scraped from http://www.cashgenerator.co.uk/prod...s/vintage-ross-re-265-on-ear-headphones-GT667 )

75 Ohm, 100 dB/mW

so 4 Vpk, 5 ma should give 120 dB SPL

120 dB SPL is literally deafening at minuites per day

but can occur as rare peaks in live music - but which you should only want for seconds in hours of listening to extreme dynamic range music

https://web-beta.archive.org/web/20070320004744/http://headwize.com/articles/hearing_art.htm
 
#18
jcx said:
( scraped from Vintage Ross RE-265 On Ear Headphones GLASGOW 2 )

75 Ohm, 100 dB/mW

so 4 Vpk, 5 ma should give 120 dB SPL

120 dB SPL is literally deafening at minuites per day

but can occur as rare peaks in live music - but which you should only want for seconds in hours of listening to extreme dynamic range music

https://web-beta.archive.org/web/20070320004744/http://headwize.com/articles/hearing_art.htm
Click to expand...
Those are the ones. Only listen to classical music, something like lute violin. Full orchestra rarely and I am very mean with volume.
 
#19
VictoriaGuy said:
A few thoughts:
You can often get those 'kits' in fully assembled form for not much extra money. If it doesn't work, you can't be blamed for the problem.

I can rationalize buying a 'clone' if 'the real thing' is grossly overpriced, and if the clone doesn't look like a 'forgery'. A Lehmann clone with the Lehmann name and logo on the front panel is something I wouldn't buy.

My personal opinion is that there's a lot more variability between headphones ('quality') than between headphone amps, so you'll probably be satisfied with any amp that will drive your headphones. Some HP amps are cheap enough that they are in the 'play' category.

There are quite a few DIY options as well - are you interested in that sort of project?
Click to expand...
Yes definitely, I think I will plump for:
Headphone Amplifier Board Reference Lehmann circuit design Kit AC 15V?0?15V | eBay
It doesn't have Lehmann on it, is cheap and I have a case and a nice toroid transformer. What I realy wanted was a review from a user and victoriaguy has given that.
 
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