NAD: sound city to hiwatt conversion

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NAD: sound city to hiwatt conversion

Postby joshuatsp on Fri Mar 14, 2014 3:44 am

.....and I don't like it.

Picked it up on a whim, without playing it (online).

Really it's not bad, just not what I was expecting.
Seems like I take a chance on a weird amp every couple years.

It's painfully bright unless I turn down the presence, treble and mids nearly all the way when the channels are internally jumpered.
Each channel used separately sounds less extreme.

It's probably the loudest amp I've ever had though. Good crap it's loud.

I think it's supposed to be a OL model.
It's got a master, gain and dual channel volume controls.

Never played a real Hiwatt......so I have no basis for comparison.
Image

any thoughts or suggestions?
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Re: NAD: sound city to hiwatt conversion

Postby Papa Dog on Sat Mar 15, 2014 1:05 am

pitty
gut shots would help us see what all has been done.
schematics are on Sound City Site schematics.
you should be able to set it back to rights fairly easy.

Since it already has some chassis punching you might want to do a propper master volume mod or a couple others.
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Re: NAD: sound city to hiwatt conversion

Postby joshuatsp on Sat Mar 15, 2014 3:36 am

Papa Dog wrote:pitty
gut shots would help us see what all has been done.
schematics are on Sound City Site schematics.
you should be able to set it back to rights fairly easy.

Since it already has some chassis punching you might want to do a propper master volume mod or a couple others.


More pics coming tomorrow.

I'd prefer to make it a classic hiwatt, not a sound city.
Since I think it may be closer to a hiwatt now.

It has a master volume. Gain, and idividual channel volume controls.
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Re: NAD: sound city to hiwatt conversion

Postby Papa Dog on Sat Mar 15, 2014 6:41 am

joshuatsp wrote:More pics coming tomorrow.

I'd prefer to make it a classic hiwatt, not a sound city.
Since I think it may be closer to a hiwatt now.

It has a master volume. Gain, and idividual channel volume controls.


So...have you ever played a correctly functioning Sound City 120+ ?

Most of those conversions kept the Sound City power section and just pulled the active tone control and put in some kind of lame "HiWatt type" passive tone stack. Don't get me worng, I am not saying that HiWatts are lame, but the implementations of the tone stack usually is.
Bunch of 1 pFd and a few .015 mFd caps (all mustards) for the harvesting and all ya get is something much less flexible or elegant.
Most of them have been so gutted, not because they do not sound great, but because someone could not get some hiss or hum out of the circuit.

I will wager that the turret board and tube sockets are still there so putting back to stock would be little issue.
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Re: NAD: sound city to hiwatt conversion

Postby Mr. Foxen on Sat Mar 15, 2014 2:48 pm

joshuatsp wrote:I'd prefer to make it a classic hiwatt, not a sound city.


That isn't a thing that can be done. You have a choice of a Sound city, or a broken Sound City.
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Re: NAD: sound city to hiwatt conversion

Postby joshuatsp on Sat Mar 15, 2014 7:02 pm

Image

I didn't modify the amp.
Image
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Re: NAD: sound city to hiwatt conversion

Postby Unit_1 on Sat Mar 15, 2014 9:22 pm

(removed dup post after page not found error *struck again*)
Last edited by Unit_1 on Sun Mar 16, 2014 4:39 pm, edited 1 time in total.
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Re: NAD: sound city to hiwatt conversion

Postby Unit_1 on Sat Mar 15, 2014 9:24 pm

whoa, who liberated the mustard caps and replaced them with metalized poly caps??? radial not axial :dumass:

should be a crime...
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Re: NAD: sound city to hiwatt conversion

Postby Mr. Foxen on Sun Mar 16, 2014 3:37 am

That has had all its innards replaced. standout part is only 4 power valves, if it still has its transformers, the OT is meant for 6 valves, so that will be running wrong too. Didja get it on ebay and can get money back for being total hack job?
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Re: NAD: sound city to hiwatt conversion

Postby Papa Dog on Sun Mar 16, 2014 7:05 am

thats the problem with "one offs" like that.
someone builds an amp that they think they want, or has it built, and it does not live up to expectations or that person needs to recover their money...then they sell it off claiming it to be something which it is not.

I lost the wager...and am surprised at how much has been robbed from that amp.
Yes, it has a Sound City head sleeve and chassis...maybe the transformers...but it aint a Sound City amp converted to a Hiwatt...it is a one-off custom job...and should have been sold as such.
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Re: NAD: sound city to hiwatt conversion

Postby joshuatsp on Sun Mar 16, 2014 3:10 pm

Mr. Foxen wrote:That has had all its innards replaced. standout part is only 4 power valves, if it still has its transformers, the OT is meant for 6 valves, so that will be running wrong too. Didja get it on ebay and can get money back for being total hack job?


I did and I'm hoping so.
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Re: NAD: sound city to hiwatt conversion

Postby joshuatsp on Sun Mar 16, 2014 7:16 pm

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Re: NAD: sound city to hiwatt conversion

Postby Mr. Foxen on Sun Mar 16, 2014 8:49 pm

Transformers suited to 6 output valves won't suit other numbers so well. If they don't know what about amps, then the rest of it will be done to equivalent level of knowledge.
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Re: NAD: sound city to hiwatt conversion

Postby Papa Dog on Mon Mar 17, 2014 6:53 am

joshuatsp wrote:Guy says it's supposed to be this.http://www.ceriatone.com/images/layoutP ... t504OL.jpg


well, it aint.
that layout shows 2xel34 so it is a 50 watt amp at best...yours has 4xpowe r tubes...whatever they happen to be...so it is likely at least 100 watts.

lets take a look at your transformers and see whatcha got to work with there.
There Ain't No Such Thing As A Free Lunch.

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Of shoes--and ships--and sealing-wax--
Of cabbages--and kings--"
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Re: NAD: sound city to hiwatt conversion

Postby Mr. Foxen on Tue Mar 18, 2014 2:08 am

Papa Dog wrote:so it is likely at least 100 watts.


Maybe by intention, but running wrong load on valves because wrong transformer (assuming SC120 OT remains) means might not be running as well as they could be.
New music: https://warriorpope.bandcamp.com/album/anchorite
Gear tinkering blog: http://ampstack.wordpress.com/
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