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Old 16th November 2002, 06:00 AM   #1
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Default Amber Series 70

Do any of you guys remember anything about this amp (vintage late 70s). When i worked hifi we sold a couple of them and (now having scored one) i'd like to know a bit more about it.

What i do know: built like a tank, 70W/channel, black.

And i found this comment from Bill F http://www.diyaudio.com/forums/showt...mber#post57039. Bill can you tell me more?

dave
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Old 16th November 2002, 12:19 PM   #2
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What is it that you would like to know?
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Old 16th November 2002, 01:42 PM   #3
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Quote:
Originally posted by Bill Fitzpatrick
What is it that you would like to know?
Thanx.

History. Broad circuit details. Anecdotes. Your experience with them.

dave
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Old 16th November 2002, 03:07 PM   #4
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Default You see, I happen to know where the Second Foundation really is.

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Old 16th November 2002, 03:11 PM   #5
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History:
<blockquote>
There were differences between the designer(s) and those with the money. This proved to be the downfall of the company. They closed shop somewhere around 1979 after only a few years of operation.

The amps came in several flavors. Some had heat sinks on the rear, some on the sides. There was a black panel rack version, a grey panel non-rack version with rack "wings" available.

There was also a pre-amp (in both black and natural) and a tuner. And, I believe, an integrated amp. I have 3 of the Stereo 70 amps and a pre-amp.
</blockquote>

Circuit:
<blockquote>
BJT in Class AB. Unique to this amp is the LM391N-100 chip which is still available. If you're going to keep the amp I suggest you get a few chips just in case they become unavailable in the future. You may also want to seek out and download a data sheet on the chip. I have a couple of amp schematics but they lack notations as to which serial numbers they apply to. You're welcome to copies if you like. There are no protection circuits except the speaker fuses. There are not enough output devices and heat sinking is insufficient to bias these into class A. You may want to clean the contacts on the plug-in printed circuit card; after these many years they probably need it.
</blockquote>

Experience:
<blockquote>
They are very nice sounding amps but you don't want to push them overly hard into 4 ohms. The 2N5686 and 2N5684 output devices are still available at a cost of about $8 each. When one amp died on me I had to replace the outputs and drivers. The LM391 survived.

I haven't used mine in many years but have been thinking about pressing them into service again. First thing I'll do is make new, black rack mounted front panels for them. 2 of my amps have the rack wings and they aren't pretty.
</blockquote>

Anecdotes:
<blockquote>
I have seen a number of these on ebay and they are ocassionally misrepresented as class A amps.
</blockquote>
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Old 17th December 2007, 01:17 AM   #6
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I just picked up an Amber Series 70 amp, the kind with the heat sinks on the side, really nice sounding amp...
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Old 17th December 2007, 06:46 PM   #7
AVWERK is offline AVWERK  United States
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Where are you finding the LM391-100v version? A few years back I couldn't find them. They made a 80V version also not applicable to the amber.

Regards
David
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Old 30th September 2008, 09:45 AM   #8
Luke is offline Luke  New Zealand
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theres one for sale here

http://www.trademe.co.nz/Electronics...-178862051.htm
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Old 30th September 2008, 04:13 PM   #9
johnYks is offline johnYks  Australia
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Hello !

Contact Nick at Audiophile.com.au in Melbourne AUSTRALIA
he should be able to help you with any information you recquire.
Nick has been in the Audio Business almost forever and is a
thorough gentleman.

I believe he owns the Amber inventory and sells them to
this day - a very likeable product.

The address is www.audiophile.com.au

Yours sincerely
John
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Old 30th September 2008, 07:56 PM   #10
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Thanx. The amp is long gone now...

dave
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