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NAD: Beaten up AD200B - Updated with Pics

Posted: Sun Apr 30, 2017 7:45 am
by OU818
So quick back story, a local music store is closing down and they have an AD200B MkIII that was used as the backline for the Soundwave festivals for sale for $500 AUD (the RRP is over $3k).

Thug is, it's beaten up from being a festival touring rig and currently tube 1+3 are blown, along with the fuse and one HT fuse.

I am tempted to buy it and give it to my tech to repair as even if the repair bill was a couple of hundred, in the end I'd have a working AD200 for pretty damn cheap.

Do you guys think it could be repaired or is it a big risk?

Re: Should I buy a busted AD200B?

Posted: Sun Apr 30, 2017 10:38 am
by a.hun
OU818 wrote:So quick back story, a local music store is closing down and they have an AD200B MkIII that was used as the backline for the Soundwave festivals for sale for $500 AUD (the RRP is over $3k).

Thug is, it's beaten up from being a festival touring rig and currently tube 1+3 are blown, along with the fuse and one HT fuse.

I am tempted to buy it and give it to my tech to repair as even if the repair bill was a couple of hundred, in the end I'd have a working AD200 for pretty damn cheap.

Do you guys think it could be repaired or is it a big risk?
If the transformers haven't been damaged there is nothing else which should cost a huge amount of money to fix. However that is a little hard to tell if it isn't working properly...


Andy.

Re: Should I buy a busted AD200B?

Posted: Sun Apr 30, 2017 10:48 am
by OU818
a.hun wrote:
OU818 wrote:So quick back story, a local music store is closing down and they have an AD200B MkIII that was used as the backline for the Soundwave festivals for sale for $500 AUD (the RRP is over $3k).

Thug is, it's beaten up from being a festival touring rig and currently tube 1+3 are blown, along with the fuse and one HT fuse.

I am tempted to buy it and give it to my tech to repair as even if the repair bill was a couple of hundred, in the end I'd have a working AD200 for pretty damn cheap.

Do you guys think it could be repaired or is it a big risk?
If the transformers haven't been damaged there is nothing else which should cost a huge amount of money to fix. However that is a little hard to tell if it isn't working properly...


Andy.
I managed to get it turned on and saw the working tube filaments start glowing but that's as much as I could get without new fuses and tubes. It seemed that it was powering up.

Re: Should I buy a busted AD200B?

Posted: Sun Apr 30, 2017 2:57 pm
by fiveightandten
a.hun wrote: If the transformers haven't been damaged there is nothing else which should cost a huge amount of money to fix. However that is a little hard to tell if it isn't working properly...

Andy.
+1

If t were me, I'd want to check out a few things:
-Transformers were ok. Those aren't cheap.
-Printed circuit board isn't damaged from any burned components, arcing over the sockets, etc.

I'm not sure if the OE irons are available, but the Mercury Magnetics replacements are $300US-$400US each.

Re: Should I buy a busted AD200B?

Posted: Sun Apr 30, 2017 3:22 pm
by bclaire
I'd go for it... sounds like for pretty cheap you could get into one sweet amp - with a cool backstory!

Re: Should I buy a busted AD200B?

Posted: Sun Apr 30, 2017 3:28 pm
by Jondog
I'd go for it

Re: Should I buy a busted AD200B?

Posted: Sun Apr 30, 2017 4:01 pm
by Gladmarr
You definitely want them to let you open it up and look for burnt or otherwise messed up stuff inside. As stated above, transformers are your biggest worry/potential expense.

Re: Should I buy a busted AD200B?

Posted: Sun Apr 30, 2017 4:25 pm
by Jondog
I'm thinking at $500, even if a transformer is shot, you could move it along and get your money back if you don't want to repair it.

Re: Should I buy a busted AD200B?

Posted: Sun Apr 30, 2017 7:59 pm
by Les Paul Lover
It sounds like a bargain.

Perhaps you can even haggle that down further..... ;)
But even at that price, it sounds like a bargain.

Re: Should I buy a busted AD200B?

Posted: Sun Apr 30, 2017 8:23 pm
by Dark Helmet
If you don't buy it, I will.

and the shipping will be hideous....

Re: Should I buy a busted AD200B?

Posted: Sun Apr 30, 2017 11:27 pm
by OU818
As my mate works at the store I asked if I could come in and take it apart to inspect it.

He said that was fine so I will be going in today to check it out. If there is nothing obviously shot looking in it I think I will be buying it.

I guess my biggest dilemma then will be which amp to use, the AD200 or the OB1-300. :mrgreen:

Re: Should I buy a busted AD200B?

Posted: Sun Apr 30, 2017 11:34 pm
by Les Paul Lover
OU818 wrote:As my mate works at the store I asked if I could come in and take it apart to inspect it.

He said that was fine so I will be going in today to check it out. If there is nothing obviously shot looking in it I think I will be buying it.

I guess my biggest dilemma then will be which amp to use, the AD200 or the OB1-300. :mrgreen:

To be honest, if something looks obviously shot, like a capacitor or else, it's even more a reason to buy it. Capacitors are pretty cheap, resistors too. The only expensive thing really are the trannies.

Re: Should I buy a busted AD200B?

Posted: Sun Apr 30, 2017 11:50 pm
by OU818
Les Paul Lover wrote:
OU818 wrote:As my mate works at the store I asked if I could come in and take it apart to inspect it.

He said that was fine so I will be going in today to check it out. If there is nothing obviously shot looking in it I think I will be buying it.

I guess my biggest dilemma then will be which amp to use, the AD200 or the OB1-300. :mrgreen:

To be honest, if something looks obviously shot, like a capacitor or else, it's even more a reason to buy it. Capacitors are pretty cheap, resistors too. The only expensive thing really are the trannies.
I meant more along the lines of scorched circuit boards or melted transformer wiring.

Re: Should I buy a busted AD200B?

Posted: Mon May 01, 2017 1:15 am
by Dark Helmet
OU818 wrote:
I guess my biggest dilemma then will be which amp to use, the AD200 or the OB1-300. :mrgreen:

methinks you won't be that torn once you get it up and running and realize how enormous that amp can actually sound...

Re: Should I buy a busted AD200B?

Posted: Mon May 01, 2017 2:18 am
by OU818
So I went and checked it out, forgot to take pictures though so sorry guys. I will once I pick it up in a few days (not able to carry that home on the Triumph).

We ripped the fuses out and replaced them with fresh ones from a new stock AD200. Switched on standby then cringed as we hit ON. Nothing popped or exploded.

Plugged in a bass and turned the volume up. IT WORKS!

All 4 power tube filaments started glowing nicely and there was no weird sounds or pops coming out.

I did notice that Tube 4 was getting significantly more blue than the others but that is about it. We turned it off as there was a bit of a hot smell coming from it, not exactly over the top but we were playing it safe. After that I decided to take the chassis out and check the board. Well, figured out the hot smell could be from the 2mm thick dust inside it. I have no idea how it was stored but it looks like it may have been underground. I checked the board and couldn't see anything wrong. R17 which I think is Tube 3 grid resistor looked a little off colour but that's it.

The only other issue I noticed was that it looks like it has been hit into something as the faceplate's right top corner was slightly bent inwards and I could see where it had hit against the transformer. I am assuming somebody walked into a door whilst carrying it as it doesn't look dropped (no tears or dents in the wood around that section).

In the end I didn't even haggle as we both knew that $500 was a steal considering it probably just needs a basic service and 4 new power tubes.

I kind of regretted buying the OB1-300 yesterday now however as I got a bit of a bargain on that as well I can either keep it for smaller gigs or when I don't want to lug a heavy head around.