Inverting is no more an issue than with the VT 60

Posted by Keith Lockwood on September 17, 2004 at 11:44:47

In Reply to: Re: Jay, the input and driver tubes may need to be adjusted posted by tube lubba on September 17, 2004 at 11:09:26:

I do feel that the S.E.D. 6550 will make the amp perform the way it was intended to. The EH 6922 is a great sounding tube and if you get the rail voltages right would be a keeper. The KT's may work better with this done. Something isn't right if you don't like the bass on that amp as the bass is one of it's many qualities that are amazing.My bet is that within it's power range it holds it's own with the REF series amps as far as beauty of sound.

The manual makes no mention of this adjustment so the previous owner or the tech may not have been aware it needed to be done. Most tube amps like your VT60 you can just plug in new input/driver tubes, bias the outputs and fly without this. He may have had other tube amps in the past and assumed that this could be done. If you buy tubes from ARC they may be able to send you 6922's that plug right in as they have matched them and done some measurments, but I'm not sure of this at this point.

My friend got his VT50 used from a guy that used it single ended. When he got the amp there were no jumpers for the XLR's for SE opperation. When he asked the guy where they were he didn't know what he was talking about. WOW what a bone head. It's no wonder he sold it. Wec got some from ARC and all is as it should be now. The amp is a small wonder. Don't give up on it. I will never give mine up!

Good luck and let me know what you end up doing.

To fix the polarity just reverse black for red on one end of your speaker wire. It's too easy.

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Follow Ups Full Thread

Topic - ARC VT-50 + AI Modulus 3a = WEAK BASS...help! - tube lubba 12:58:43 09/16/04 (19)

Jay, the input and driver tubes may need to be adjusted - Keith Lockwood 08:45:22 09/17/04 (8)

Keith, you were right! - tube lubba 08:31:55 09/18/04 (4)

Most people don't know - Keith Lockwood 08:52:47 09/18/04 (3)

Re: Most people don't know - tube lubba 10:19:36 09/18/04 (2)

I still have Sovteks' in there - Keith Lockwood 15:50:14 09/18/04 (1)

Re: I still have Sovteks' in there - tube lubba 21:50:19 09/18/04 (0)

Re: Jay, the input and driver tubes may need to be adjusted - tube lubba 11:09:26 09/17/04 (2)

Inverting is no more an issue than with the VT 60 - Keith Lockwood 11:44:47 09/17/04 (1)

I was using the VT-60 with an LS-7....sorry for the confusion..n/t - tube lubba 13:18:54 09/17/04 (0)

Get some S.E.D. 6550's and ditch the 88's - Keith Lockwood 05:37:38 09/17/04 (3)

Re: Get some S.E.D. 6550's and ditch the 88's - tube lubba 05:51:17 09/17/04 (2)

Re: Get some S.E.D. 6550's and ditch the 88's - Keith Lockwood 06:44:43 09/17/04 (0)

Re: Get some S.E.D. 6550's and ditch the 88's - Keith Lockwood 06:11:22 09/17/04 (0)

Re: ARC VT-50 + AI Modulus 3a = WEAK BASS...help! - ear-mite 20:24:51 09/16/04 (4)

Re: ARC VT-50 + AI Modulus 3a = WEAK BASS...help! - tube lubba 21:01:39 09/16/04 (3)

Re: ARC VT-50 + AI Modulus 3a = WEAK BASS...help! - ear-mite 06:32:58 09/17/04 (2)

you may be right, but it also has great bass used single ended.nt - Keith Lockwood 06:46:26 09/17/04 (1)

one tweak for SE VT 50 and 100 users. - Keith Lockwood 06:53:29 09/17/04 (0)

Re: ARC VT-50 + AI Modulus 3a = WEAK BASS...help! - undertow@inorbit.com 13:05:08 09/16/04 (0)

Follow Ups

Inverting is no more an issue than with the VT 60 - Keith Lockwood 11:44:47 09/17/04 (1)

I was using the VT-60 with an LS-7....sorry for the confusion..n/t - tube lubba 13:18:54 09/17/04 (0)

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