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I raced my partner from home in Dartford to the V+A Museum today. She went by bus and train, I went by Dawes Fixie conversion.
Less than 20 seconds in it to the entrance steps between us, she confessed she had to 'leg it' up the steps to beat me, hahahahaha, she's a 55 y/o arthritic Mum of 2 n'all, respek dearest! :)
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I rode to St Pancras from Dirtfud and back. I got a puncture on the way up, I mendeded it. My little pump wouldn't inflate the big 32C tyre up to 6.5Bar without my arms falling off. I stopped at the CS3 track pump stand to pump up to correct happy pressure. Helped a young girl pump her tyre up before I did mine as she'd accidentally let all the air out of her tyre using the wrong orifice. Felt good, smiles all round. I went on my way. Huzah for having a pulse and breathing. Boo Hiss to mighty headwind all the way back home.
A nice 43 miler.
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Tank, Castle and Cove.

I swapped Lundun for Lulworth on the Dorset Coast for a week. 'Changeable' weather down there this week, I got out on my/the only (?!) SS a nice little loop. Never had a proper tank pull up behind me before whilst in a queue waiting for the level crossing barrier to rise. I'm guessing it must've come from the tank Museum at Bovington.
Hilly for me, had to stop twice to prevent my heart killing me in the face due to hills and no gears but I didn't give up. Hurrah!

Nice to be out riding again after scary health issues.
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'Buzzy' feeling, it could also be the fact that if neither the Amp or the TV are earthed (fitted with a 3 core mains cable) the 'floating' design of the PSU in the TV is causing the casework of the amp to 'sit' on an AC voltage.
I've had this happen to me when I fitted a DC power supply to a Bass Guitar effect pedal/looper. The PSU was purposed for an Iomega Zip drive (5V at 2A or so). What I didn't realise is that DC level was sitting on an AC level of ~55V or so! I got a tingle (buzzy feeling) whenever I brushed against anything that was proper grounded.
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Possibly, or power supply noise from the iMac being picked up and fed into the amp? It increases when the amp goes to sleep suggests when the demand is less on the iMac's internal PSU its being fed down the 3.5mm (I assume you're using that kinda connector out the headphone/line out socket?). Is the iMac definitely plugged into a grounded mains socket? I'm floundering/guessing as sometimes trying to diagnose Electronics faults via webbernet is like performing keyhole surgery with one hand over your eyes sometimes!
Does the amp work OK with other sources like a CD player or batt powered MP3 player? Noise/buzz free?
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Yups, so many variables. We hear with our brains not with our ears a retired audiologist chum always reminds me. Thats why we're not always good arbiters of sound quality. The ears are transducers, they're not calibrated and vary due to may other factors eg tiredness, temp, recent exposure to SPL etc. The ol' brain has to compute and process all that variable info, thats the really clever bit. Based on what our brains tell us we then need to communicate how we feel about what we're hearing and compare it to 'results' from the next persons test equipment ie- their own ears/brains/perceptions .
Variance? Un realiable 'organic' test equipment, you got it in humans by the shed loads. Add more than one 'test' human and it gets even more bonkers :)
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I dunno if I can answer that as I haven't heard their cables. I also might not hear what they (or maybe your chums 'want'?) to hear, thats part of the reason its such a trixy subject.
I'm an ex-cable-sceptic BTW. "I can see through all this crap, I'm a Tech".... I used to think to myself. Yup, I thought it was all BS until I heard differences for myself. Note use of the word 'differences', NOT better or worse than.
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EDIT in response to Dicki
Wurd bro!
What is the world coming to when one has to regenerate ones own mains power just to listen to smart beatz? I ask you!
I didn't realise just how bad our mains power was until I was looking at a problem on a valve amp project. Various other folk involved in building kit have reported DC off set, distortion, noise and switching spikes. It also may explain why sometimes folk hear differences to their own replay systems when they're used at different times during the day as the loads and resultant crud chucked into the grid may peak and trough during the day and night.
I reckon its really interesting.

Observe the this bit of map.

See that green dotted line next to the Wey Navigation? Is that cyclabubblebubble? It seems to link up with a network of Cyclepaths further down the canal, 221 being the one I'd like to connect up with.