design flaw

Zinky Superfly Blog - Part 55: Ship Tomorrow!?

From: zinky@zinky.com
Subject: Re: $1000 says you can fix my Superfly by 31 July
Date: 15 September 2009 02:06:01 BST
To: david@dave.st

replaced the failed relay today.

Should ship tomorrow, no charge.

BZ

From: zinky@zinky.com
Subject: Re: $1000 says you can fix my Superfly by 31 July
Date: 17 September 2009 16:54:24 BST
To: david@dave.st

David;

could you email the address you want this chassis sent to:

info@zinky.com

That's the shipping computer. This computer is at my house.

BZ

PS: also had to replace the Mercury Magnetics brand reverb transformer...Which would have been the second MM reverb transformer in your amp we had to replace.

I knew the first one was junk (which is why we replaced it), but I had no idea the second one would fail, too.

We used a Marvel transformer to replace it, which is what we use for every reverb transformer now (No failures in the 5 or 6 years we've used them).

BZ

Oh, joy - actual activity! Ship tomorrow! A second email!

Some harsh words about their transformer suppliers there.

But hang on... what about the silver case? Perhaps I should send yet another reminder of what I'm expecting - see part 56.

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Zinky Superfly Blog - Part 30: Working On It

From: zinky@zinky.com
Subject: Re: Superfly chassis shipped
Date: 29 April 2008 17:56:48 BST
To: david@dave.st

Hi David;

It's an early amp, in the #0030'-0040 range.
Adrian put the upgraded transformer inside, as the original Mercury Magnetics units proved to be total crap.

we are working on it today to bring it up to the latest specifications.

BZ

Here's the first expression of dissatisfaction with the ill-fated reverb transformer, but why worry? Bruce is working on the amp that very day.

Naively perhaps I took this as an indication that the work could be done in the sort of timescale I'd previously imagined.

So I left it a couple of weeks before wondering how they were getting on - see part 31.

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Zinky Superfly Blog - Part 20: Suggestions Of Progress

From: zinky@zinky.com
Subject: Re: Shipping Superfly chassis
Date: 16 April 2008 17:20:58 BST
To: david@dave.st

Hello David;

That's a good design.

The original Superfly chassis design isn't, as the metal is too thin and it needs some bracing (Perhaps angles bolted to the flats) in order to keep it from bending when it gets thrown around in shipping.

Your method should work, but the most important thing would be to use at least 2" of padding (preferably solid styrofoam sheet) on all sides, and I would ship the amp transformers down, as that's where all the weight/inertia is.

Head shell- Black Tolex, yes? Did I quote you a price on that?

OK,

BZ

Finally a specific response about the head case / shell...

Also some good advice about shipping it with the transformers at the bottom. I could believe that their weight would bend the chassis down if it were dropped with them above.

By this point of course I was resigned to paying whatever it took to ship the amp out to Flagstaff AZ but I didn't know what some of the other costs would be - see part 21

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Zinky Superfly Blog - Part 17: Ship Ahoy?

From: zinky@zinky.com
Subject: Re: Superfly problems revisited
Date: 10 April 2008 15:31:36 BST
To: david@dave.st

Hello Dave;

If you were to ship the chassis, I would first wrap it in cardboard. Then seal it in a plastic bag. Then pack that with at least 50mm of padding (Styrofoam sheet material or bubble pack material would be preferred). I would not send the cabinet. You could pack the reverb pan with the chassis, just to make sure I have everything.

The chassis thickness is thinner than it should have been, so the chassis can be damaged if the amplifier is dropped. Therefore, shipping just the chassis is better.

Still, I think you could get proper function by replacing some of the plug in wires. RR2 (Reverb Return Two) and one or two other wires would be what I'd check first. I'll make a list and get back to you with that.

BZ

Some good suggestions that might help me make progress... and an interesting observation that the chassis metal is really too thin :(

However the end of this email is heading back to the "diagnose it yourself" department which was so unproductive the first time round.

I was sufficiently encouraged to reply the same day with some of my own suggestions for shipping - see part 18.

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