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  #1  
Old 17th May 2022, 01:38 AM
Pingushome Pingushome is offline
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Location: Wales
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Default WD/WAD HD83 Mk2

Hi ,
So after the kind help from snowman al and Bob, thanks to you both, the Maplin mains filter being built and Iíve now got the bug again!
I was thinking my hd83 could do with a brush up. Thereís a very small in balance between channels and a slight russell when music is very quiet. Neither is enough to need a checkout really but I inherited it form a friend and itís getting a bit long in the tooth now I think.
So I was thinking new caps/better, bigger psu caps, different diodes, and some Mills resistors for the bigger ones, check replace other resistors. Probably a pair of new valves too.
Or should I just go for the XL upgrade from Matthew?
Alternately I could go for the 3S pcb and upgrade it to a 3S. That was on the cards a while ago but then didnít think, and still donít think, Iíd need the impedance matching anyway.
Iíd be interested to know what others have done to their amps and the results. Any suggestions or thoughts on parts, makes, values would be gratefully received
Thanks
Martin
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  #2  
Old 17th May 2022, 11:48 PM
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BOONDI BOONDI is offline
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Location: Dundee, Scotland.
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Default Re: WD/WAD HD83 Mk2

Itchy fingers.....

A good upgrade to psu caps is to simply replace with higher voltage lower esr. I used 450v rubicons. Also coupling caps replaced with high quality polypropylene types of same value. As for resistors, you could try foils in the signal paths. As for valves, Watford valves have stumbled onto a limited stock of Amprex Ecl83's but they cost a bit more than the mullard types. For the diodes, some on here will no doubt have recommendations for their own particular silent ultra fast super dooper favourites.....
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  #3  
Old 18th May 2022, 06:58 AM
bob orbell bob orbell is offline
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Default Re: WD/WAD HD83 Mk2

Agree with Boondi on the power supply, Nichicon do some very good, very low ESR capacitors with which you can hear the change, they also do some very high price ones, Nick Lucas has then at Hi-Fi Collective, make sure you are sitting down though when you look at the price. Wima MKP10 coupling capacitors are also very good. Bob
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