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Grizzly

Roy Grant Amplifiers

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Having just acquired one I am hoping there may be one or two others our there with info or experiences to share.

 

The G100AS is all original, having been in storage for about 25 years, and sounds truly sublime as is. Very quiet and an easy to decipher biasing arrangement.

 

So, any others owned one?

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Any pictures of this Anthony?

 

Must admit, I've never heard of them.

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Any pictures of this Anthony?
 
Must admit, I've never heard of them.
Yep! Neither had I to be fair. 20190403_185139.jpeg20190403_205723.jpeg20190404_185333.jpeg20190403_205740.jpeg20190403_205748.jpeg

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Neat biasing arrangement, just twist the knobs next to each tube til the corresponding red lights are equally lit (at least that seems intuitively the way to do it?).

 

I guess I'd better open up the underside to see what delights await!

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If there's ever a poster boy for "warm up" this is it. Bloody thing sounds broken til it's been running for 20 minutes or so!

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Posted (edited)
28 minutes ago, Grizzly said:

If there's ever a poster boy for "warm up" this is it. Bloody thing sounds broken til it's been running for 20 minutes or so!

 

Well, you chose to dance with the devil, G!  :P

 

Andy

 

PS:  Then again, 'warm up' is not just a 'glass' thing - AIUI, Naim amps sound their best after 3 days!  :lol:

 

Edited by andyr

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12 hours ago, andyr said:

 

Well, you chose to dance with the devil, G!  :P

 

Andy

 

PS:  Then again, 'warm up' is not just a 'glass' thing - AIUI, Naim amps sound their best after 3 days!  :lol:

 

Some of the Graham Slee stuff as well Andy. Though I've never experienced as stark a contrast as in this situation.

 

And this is one gorgeous sounding amp as well, warm.

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On 05/04/2019 at 8:47 AM, Grizzly said:

Neat biasing arrangement, just twist the knobs next to each tube til the corresponding red lights are equally lit (at least that seems intuitively the way to do it?).

 

Hey Ant,

 

For biasing the power tubes you generally back the trip pots off until the led's just go off. At least that's how it's gone with the amps I have with that arrangement. 

Sounds like the tubes may be getting a little long in the tooth if it takes 20 mins for them to sound right but if they sound great after that then they're still servicable. You won't do better than the ones that are in there....

 

Cheers

 

Chris

 

 

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Hey Ant,
 
For biasing the power tubes you generally back the trip pots off until the led's just go off. At least that's how it's gone with the amps I have with that arrangement. 
Sounds like the tubes may be getting a little long in the tooth if it takes 20 mins for them to sound right but if they sound great after that then they're still servicable. You won't do better than the ones that are in there....
 
Cheers
 
Chris
 
 
This one has 2 red lights for each tube. Going too far either way results in only one or the other being lit whereas a small adjustment range leaves both lit. So I'm presuming that having both lit up equally gives the correct bias level?20190404_185333.jpeg

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18 hours ago, Grizzly said:

This one has 2 red lights for each tube. Going too far either way results in only one or the other being lit whereas a small adjustment range leaves both lit. So I'm presuming that having both lit up equally gives the correct bias level?

100% right, mate. I didn't even notice that there were 4 lights per side! Don't mind me.....

How does it compare to the v-fets?

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On 12/04/2019 at 1:54 PM, unclekanus said:

100% right, mate. I didn't even notice that there were 4 lights per side! Don't mind me.....

How does it compare to the v-fets?

 

The one time I switched from the B-1 to this it was a notable and surprising improvement on the little standmounts. The times they have been switched from transistors to glass (3 different tube amps and 2 different SS) they have increased in stature and grown another leg, so to speak.

 

I'd love to see if I can identify the origin of the Colomar rebranded small tubes, just out of interest.

 

Received a new quad of 77s from Lucas Miles today, and should see what hopefully is a NOS pair of Telefunken ECC83 very soon. I've been kindly loaned a bajillion pairs of old 12AU7 to try out as well by a local mate, so the permutations may take some time.....

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5 hours ago, Grizzly said:

 

I'd love to see if I can identify the origin of the Colomar rebranded small tubes, just out of interest.

 

Can you give us a couple more pics of the innards? Are there any other markings/etchings on the glass?

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Posted (edited)

I have the same amp though it’s not getting used currently. Waiting to get some time to go through it and have it running like new again. Generally they ran KT88’s. I serviced them back in the day when sold by Grenfell HiFi and imported by Craig Lahiff into Australia.

 

Roy Grant was the tech brains behind Grant Lumley in the 70’s and early 80’s I think, until they parted company and each started up Grant Amplifiers and Lumley Amplifiers (Ray Lumley) respectively. 

 

There was a mono version of the G100, called the G100am, and also a 200watter as well. I think there was a 60 watter too. Nice amps, reliable and very musical, as were the Lumleys. Nothing spectacular about the design, just good engineering. Ultralinear output stage and split load phase splitter and all that stuff. Good trannies and a large power transformer. 

 

They had the option of LED bar power indicators on the front panel too, though mine doesn’t. Mine came with Telefunken ECC83s and ECC82s. Can’t recall what the KT88s were, maybe original Gold Lions. Apart from perhaps earlier production, the Telefunken tubes supplied  were made in former Yugoslavia and were really EI’s.

Edited by skies2clear

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Hello skies2clear,

 

You are hopefully my ace in the hole. I am looking forward to getting Grizzly’s amp over to my place to try out on my ribbons ,which I have a sneaky suspicion might just be an excellent match.  I was banking on Grizzly moving it on so I could grab it but he seems to have fallen for it’s suductive charms! It really does seem to suit his latest speakers.

 

If push comes to shove and it really does fly with my set up I might just have to make you an offer.....

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Hi Ooogh,

 

I would be curious how the Grant works with your ribbons. Are they very low impedance loads? If so, I’m not sure how the Grant will cope. As always in audio, only one way to find out 👍

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1 minute ago, skies2clear said:

Hi Ooogh,

 

I would be curious how the Grant works with your ribbons. Are they very low impedance loads? If so, I’m not sure how the Grant will cope. As always in audio, only one way to find out 👍

It is indeed a very interesting question. They are the High Efficiency Ambience so 96dB. I thought I might be able to drive them with 20 Watts of push pull 300B’s but no chance. They seem to love current with a nice 2 to 3 Ohm dip.

 

The original Grant/Lumley’s seemed to be known for their ability not to wilt in the face of Apogees....this makes me suspect there might just be enough iron in them to take care of business.  My other plan of attack has been to locate a big old pair of VTLs and stap them on.  Any advice or experience with VTL?

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