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Post subject: Re: NAD - 68 Custom Deluxe Reverb
Posted: Sat Feb 14, 2015 5:21 am
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thought about getting one of these amps I like the features offered, maybe one day I will grab one. Does it handle pedals well?


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Post subject: Re: NAD - 68 Custom Deluxe Reverb
Posted: Sat Feb 14, 2015 11:44 am
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For the TV Jones classics I like to use the 2nd input,, Seems i go turn it up a bit more, and thats what thrills me for now, Since i only had the amp 3 days, I am sure settings will change. Now, I hear that the need to change tubes is high in these amps. I dont think the 6l6s are a problem, the other tubes would help the tone... Now what tubes to get and how to change them?


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Post subject: Re: NAD - 68 Custom Deluxe Reverb
Posted: Sat Feb 14, 2015 12:34 pm
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Rverb, to echo what Shimmilou said (I think), the two inputs definitely have different tones, not just volumes. Raise the volume on the second input until it's equivalent to the first input and you will discover that the first input is still clearly much thicker. At any equivalent volumes the first input sounds warmer, with significantly more gain. The second input is always thinner and cleaner. The difference is similar to what you hear between the Custom and Vintage channels.


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Post subject: Re: NAD - 68 Custom Deluxe Reverb
Posted: Tue Feb 17, 2015 7:45 pm
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stevieraygovan wrote:
Rverb, to echo what Shimmilou said (I think), the two inputs definitely have different tones, not just volumes. Raise the volume on the second input until it's equivalent to the first input and you will discover that the first input is still clearly much thicker. At any equivalent volumes the first input sounds warmer, with significantly more gain. The second input is always thinner and cleaner. The difference is similar to what you hear between the Custom and Vintage channels.


To my ears I hear more tonal difference between the channels than I do between the inputs.
But to be honest I don't use the 2nd input much as I don't need the lower gain. I've only tried it a couple of times just to try it but the lower volume level kept me from turning it up to get a better sense of tonal differences.

It's true that volume level affects tone because volume affects how we hear certain frequencies.
My point being that the tonal difference is more a function of what the volume does.
But you are saying that if we equal out the volume level so as to keep volume level tone perception out of it then there will still be a noticeable tonal difference with the lower gain channel sounding "thinner".
I've have to try it at higher volume to listen for the one change.
It's just that I don't have a reason to use the lower gain channel and never have used them in other amps I've had as I had/have no reason to do so.

I may try the reverb return into the lower gain input of the vintage channel to hear what it may sound like as the 6db of lower gain may offer a good gain buffer

Good info. Thanks for it. :)


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Post subject: Re: NAD - 68 Custom Deluxe Reverb
Posted: Wed Feb 18, 2015 1:48 pm
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Oh, definitely, the tonal difference between the two channels is far greater than that of the low- and high-impedance inputs. I'm only saying that even when the volumes are equalized the two inputs offer a similar type of tonal difference, though clearly not to the same degree on display between the two channels.

The low-impedance input is for when you're using humbuckers and want a really clean tone, such as this...

https://www.youtube.com/watch?v=1Ccis4FDGwY


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Post subject: Re: NAD - 68 Custom Deluxe Reverb
Posted: Sat Feb 21, 2015 4:42 pm
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I would love to put chrome corners on my 68cdr, is this possible? Where do I get the right ones for this amp? Thank you, MK


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Post subject: Re: NAD - 68 Custom Deluxe Reverb
Posted: Wed Apr 15, 2015 1:34 pm
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I've been gigging my 68 Custom quite a bit lately and i love it.
Because of the size of the venues I'm running it on about 5/6 on the volume of the Custom channel and it's wonderful.
Mine has the loud tick on the vibrato BUT you cannot hear it at gig volume, and the mic doesn't pick it up either.
Small board, 68 Custom and my Suhr tele = best rig ever !!


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Post subject: Re: NAD - 68 Custom Deluxe Reverb
Posted: Sun May 03, 2015 9:27 am
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shimmilou wrote:
Each input, for amps with two input jacks for a given channel, has a resistor connected to it in the signal path, typically 68k ohms, before the first tube, one 68k resistor connected to each jack. When using input 1, the switching part of the input jacks places both of the input resistors parallel and the parallel pair are placed in series with the signal path, effectively 34k ohms of resistance before the first tube. When using input 2, only one of the resistors is placed in the signal path, 68k ohms of resistance before the first tube. As you can see, input 2 will have twice the resistance in the signal path, attenuating that signal by 6 db, giving much lower volume for input 2.

The input jack resistors work the same regardless of which tubes are in the signal path. So whether you use 12AX7, 5751 or 12AY7, input 2 will always be attenuated by 6 db and give lower volume than input 1. If the input to the first tube is attenuated, it will affect the volume and the gain to a large degree, which will have some impact on the tone. You might notice that the tone is not quite the same when using input 2 with the volume turned up as it is when using input 1 with the volume lowered, in the same way that turning down your guitar volume affects the tone to some degree.


Also remember that if you plug anything into Input 1 and Input 2 (on the same channel,) neither one will be attenuated. Serious players rarely encounter this but I'm sure when we all started out many years ago, we shared an amp from time to time. Mostly only an issue with single channel amps...

Art


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Post subject: Re: NAD - 68 Custom Deluxe Reverb
Posted: Sun May 03, 2015 10:11 pm
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Art1 wrote:
...but I'm sure when we all started out many years ago, we shared an amp from time to time.


That scenario harkens back to Christmas of 1965, when I received a 2-pickup Teisco "tulip" as a gift, my very first guitar. On New Year's Day 1966 we had a jam at a friend's place, out on the driveway. Four of us, all plugged into one Silvertone Twin Twelve (two guitars, bass, vocal mic). What a distorted racket that must've been to the neighbors! County sheriff deputies showed up after about forty minutes to shut us down and told us later that we should all stick to little league baseball or Pop Warner football......anything that didn't involve music.

:lol: :lol: :lol:

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: NAD - 68 Custom Deluxe Reverb
Posted: Mon May 04, 2015 4:35 am
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Retroverbial wrote:
Art1 wrote:
...but I'm sure when we all started out many years ago, we shared an amp from time to time.


That scenario harkens back to Christmas of 1965, when I received a 2-pickup Teisco "tulip" as a gift, my very first guitar. On New Year's Day 1966 we had a jam at a friend's place, out on the driveway. Four of us, all plugged into one Silvertone Twin Twelve (two guitars, bass, vocal mic). What a distorted racket that must've been to the neighbors! County sheriff deputies showed up after about forty minutes to shut us down and told us later that we should all stick to little league baseball or Pop Warner football......anything that didn't involve music.

:lol: :lol: :lol:

Arjay


My first electric was a shiny new Teisco Del Ray with three pickups and those big paddle switches. :D


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Post subject: Re: NAD - 68 Custom Deluxe Reverb
Posted: Tue May 05, 2015 11:25 am
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Sorry, didn't actually update y'all. January of 2014 I ran into some medical/surgical issues that kind of put the brakes on everything for a while (a long while.) Another surgery about four weeks ago. :shock: So, now I am getting back to a somewhat normal life. The 68 CDR is still going strong and sounding even better now that she is finally fully broken in.

On another note, I saw mentioned Input 1 and 2 as high/low impedance. Not true! Both are high impedance. Input 2 is just attenuated a bit. Officially, this was intended for guitars that contain preamps. (it does add another tonal option for humbuckers though.)

Art


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Post subject: Re: NAD - 68 Custom Deluxe Reverb
Posted: Tue May 05, 2015 1:31 pm
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Art1 wrote:
On another note, I saw mentioned Input 1 and 2 as high/low impedance. Not true! Both are high impedance. Input 2 is just attenuated a bit. Officially, this was intended for guitars that contain preamps.


Or keyboards and accordions.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: NAD - 68 Custom Deluxe Reverb
Posted: Tue May 05, 2015 2:05 pm
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Little clip of mine from last week, Custom channel and an MXR Carbon Copy for a little delay.

https://www.youtube.com/watch?v=0B-g1mqHBXM


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Post subject: Re: NAD - 68 Custom Deluxe Reverb
Posted: Fri May 08, 2015 9:00 pm
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Few months with my 68cdr, sounds much nicer each time i use it, just got a purple jewel for it, looks a lot nicer.


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Post subject: Re: NAD - 68 Custom Deluxe Reverb
Posted: Mon May 11, 2015 6:07 pm
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mak1965@msn.com wrote:
Few months with my 68cdr, sounds much nicer each time i use it, just got a purple jewel for it, looks a lot nicer.



Always nice to change the jewel out now and then. Keeps everybody guessing. :D

Art


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