You are here

Digital amplifier repair (Flying Mole) - help needed

Customising, building or repairing your own gear? Need help with acoustic treatment or soundproofing? Ask away…

Re: Digital amplifier repair (Flying Mole) - help needed

Postby Jack Ruston » Thu Dec 08, 2011 10:19 pm

Dan, I've just ordered an amp from classdaudio.com. It was 600 dollars and I'm told by a reliable source that it's 'amazing'. I will check it out and let you know. If it's good, it might be a worthwhile solution.

J
Jack Ruston
Frequent Poster (Level2)
Posts: 3790
Joined: Wed Dec 21, 2005 1:00 am

Re: Digital amplifier repair (Flying Mole) - help needed

Postby dmills » Fri Dec 09, 2011 2:02 am

Dave,
given a working amplifier, do you really think it would take me (or any halfways competent analogue 'tronics type) more then about a day or 3 to rev. eng. the voicing networks.

Getting them empirically right might be tediously tweaky, but the netwoks themselves are rarely anything massively complex.

And yea, the usual suspects have plenty of analogue expertise on hand if they need it.

Regards, Dan.
dmills
Frequent Poster
Posts: 1552
Joined: Fri Aug 25, 2006 12:00 am
Location: High Wycombe, UK

Audiophiles use phono leads because they are unbalanced people!


Re: Digital amplifier repair (Flying Mole) - help needed

Postby . . . Delete This User . . . » Fri Dec 09, 2011 2:26 am

i'm quite impressed by some offerings from Ground sound

http://www.groundsound.com/
. . . Delete This User . . .
Frequent Poster (Level2)
Posts: 2368
Joined: Mon Jun 23, 2008 12:00 am

Re: Digital amplifier repair (Flying Mole) - help needed

Postby ef37a » Fri Dec 09, 2011 8:53 am

dmills wrote:Dave,
given a working amplifier, do you really think it would take me (or any halfways competent analogue 'tronics type) more then about a day or 3 to rev. eng. the voicing networks.

Getting them empirically right might be tediously tweaky, but the netwoks themselves are rarely anything massively complex.

And yea, the usual suspects have plenty of analogue expertise on hand if they need it.

Regards, Dan.

No Dan I do not think that. My point is that the company PERCEPTION is that circuits will be copied and that is why they don't stick a schematic in every cab.

My personal view is that circuit information should be readily available and for other reasons than just the service man's convienience.

And if a "certain" company wants to rip the works, at least they will have to buy an amp first! But then it has long been page one, book one of the electronics designers bible, "See how the other buggers did it first".

Dave.
ef37a
Jedi Poster
Posts: 11294
Joined: Mon May 29, 2006 12:00 am
Location: northampton uk
#They did not listen, they are not listening still...Perhaps they never will?#

Re: Digital amplifier repair (Flying Mole) - help needed

Postby Martin Walker » Fri Dec 09, 2011 2:30 pm

Jack Ruston wrote:Dan, I've just ordered an amp from classdaudio.com. It was 600 dollars and I'm told by a reliable source that it's 'amazing'. I will check it out and let you know. If it's good, it might be a worthwhile solution.

J

That sounds most interesting Jack - looking forward to your feedback 8-)


Martin
User avatar
Martin Walker
Moderator
Posts: 15194
Joined: Wed Jan 13, 2010 9:44 am
Location: Cornwall, UK

Re: Digital amplifier repair (Flying Mole) - help needed

Postby Dan B » Wed Dec 14, 2011 2:08 pm

Indeed! Let us know how it works out. I take it that it's this one:

http://classdaudio.com/products/complete-amplifiers-1/magic-garden-mastering-amplifier.html
Dan B
Regular
Posts: 155
Joined: Tue Jan 30, 2001 1:00 am
Location: London

Re: Digital amplifier repair (Flying Mole) - help needed

Postby Martin Walker » Wed Dec 14, 2011 6:22 pm

It’s certainly $600, but what an odd design!

Completely blank front panel and gain controls on the rear :headbang:


Martin
User avatar
Martin Walker
Moderator
Posts: 15194
Joined: Wed Jan 13, 2010 9:44 am
Location: Cornwall, UK

Re: Digital amplifier repair (Flying Mole) - help needed

Postby James Perrett » Thu Dec 15, 2011 12:39 pm

I guess that they expect most users to have a mixing desk or monitor controller so that the gain controls are just there to match the amp sensitivity to whatever else you are using. Some of us use amps with no gain controls - although I've made a small attenuator box to go inline for my monitor amp.

James.
User avatar
James Perrett
Moderator
Posts: 8913
Joined: Mon Sep 10, 2001 12:00 am
Location: The wilds of Hampshire
JRP Music - Audio Mastering and Restoration. JRP Music Facebook Page

Re: Digital amplifier repair (Flying Mole) - help needed

Postby Dan B » Thu Dec 15, 2011 5:16 pm

I guess so. Still, a pain adjusting the trims on the back of a rack. At least it's a "set once and forget" thing. I'm using a hi fi pre-amp with my Moles (discontinued s/h Cambridge Audio C500 - probably sacrilegious but I was struggling to fund - or justify - paying a lot more for a volume control).

The ebay Moles went for £430 odd including postage. And only one of the pair was working properly. I wasn't prepared to stretch to that: I paid less than that for a brand new pair. Since I actually have 4 Moles (only 3 working) and 2 sets of PMC TB2s's with 2 CA C500 pre's (studio set and live room/living room set). So I suspect I'll keep the third Mole as a spare (I gather quite a few class d amps have reliability issues in the longer term) and look for a new amp.

I'd be interested to hear about the $600 one above (probably the best part of £600 once import duty, VAT, shipping and handling all accounted for). Perhaps even more tempting (based on favourable reviews - e.g. http://www.audiocircle.com/index.php?topic=76400.0 - and low price) is this: http://classdaudio.com/index.php/120w-x-2-240w-x-1-amp-power-supply-transformer.html

Any thoughts / comments?

I'm struggling to imagine that any traditional class A/B or tube amp offers as much bang for buck, but do let me know if I'm wrong here.
Dan B
Regular
Posts: 155
Joined: Tue Jan 30, 2001 1:00 am
Location: London

Re: Digital amplifier repair (Flying Mole) - help needed

Postby forumuser695516 » Thu Dec 15, 2011 6:34 pm

^ Thats partly why I went with Hypex. They are dutch, so no import duty/taxes to worry about. And from what I could gather at the time, they seemed to have about the best reputation going for Class D kit. Which in turn also means they are not the cheapest. But still a bloody good amp for the money.
I guess it could self detonate some time, but so far so good (1.5 years or so)
forumuser695516
Frequent Poster
Posts: 850
Joined: Wed Sep 01, 2004 12:00 am

Re: Digital amplifier repair (Flying Mole) - help needed

Postby James Perrett » Fri Dec 16, 2011 11:39 am

The specs on even the cheapest Hypex amps are much better than the ClassDAudio ones. While paper specs don't mean everything, there are so many mastering engineers using them that I'd say they're a safe bet.

James.
User avatar
James Perrett
Moderator
Posts: 8913
Joined: Mon Sep 10, 2001 12:00 am
Location: The wilds of Hampshire
JRP Music - Audio Mastering and Restoration. JRP Music Facebook Page

Re: Digital amplifier repair (Flying Mole) - help needed

Postby Paulusuk » Fri Dec 16, 2011 4:03 pm

Hi Dan B
If you are still looking at repair for amp maybe this might be of use to you....

http://www.freepatentsonline.com/6992527.html

All the best
Paulus
Paulusuk
Posts: 1
Joined: Fri Dec 16, 2011 1:00 am

Re: Digital amplifier repair (Flying Mole) - help needed

Postby Dan B » Mon Jan 07, 2013 6:53 pm

Belated thanks for the diagram. One of my other Flying Moles has also developed the same fault, so now I have a pair to repair. If anyone knows who might be able to repair a digital amp (and that link above may well help), please do let me know. My aged Pioneer A400 has been pressed into service in the meantime, but it's not really cutting it!

Many thanks,

Dan
Dan B
Regular
Posts: 155
Joined: Tue Jan 30, 2001 1:00 am
Location: London

Re: Digital amplifier repair (Flying Mole) - help needed

Postby JonSnell » Sat Jan 25, 2014 1:37 am

I have just completed my 100th Flying Mole Amplifier repair and have achieved 100percent success.
www.flyingmole.co.uk
JonSnell
Posts: 2
Joined: Fri Jan 24, 2014 1:00 am

Re: Digital amplifier repair (Flying Mole) - help needed

Postby Hugh Robjohns » Sat Jan 25, 2014 1:48 pm

Good to know, Jon, and welcome to the SOS forums.

H
User avatar
Hugh Robjohns
Moderator
Posts: 26386
Joined: Fri Jul 25, 2003 12:00 am
Location: Worcestershire, UK
Technical Editor, Sound On Sound

PreviousNext