puri
139 posts
Feb 12, 2014
5:41 AM
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Just finished building this one a couple of days ago. It's Arne's design based on AB763 normal channel which turned out to be a pretty good harp & guitar amp. I made it into a combo amp with a pair of 10 inches - Eminence Lil' Buddy & Copperhead (I don't like any of them as a single speaker but they work together quite well!). My noodling is rubbish - just given up tryin' to sound good on youtube! I'll try to get some decent clips later but you should get an idea about how it sounds with this one..
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HawkeyeKane
2326 posts
Feb 12, 2014
7:21 AM
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Not to nitpick, but don't you mean AA763? AB763 would be the blackface Bandmaster circuit.
In any case, it sounds good to me so far! I really like the looks of the cabinet. Gives it a vintage obscure off-brand type of look. And good choice on the speaker combination! Kudos!
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Hawkeye Kane
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5F6H
1743 posts
Feb 12, 2014
12:39 PM
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AA763 & AB763 don't pertain to any one specific amp, they are both relevant to the same, large range of long-tailed PI, fixed bias BF Fenders (but never the bassman line, nor Champs & Princetons). AA763 was a short lived precursor to AB763, they have slightly different PI values. AB763 is the designation most folk have in mind when discussing BF Fenders.
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www.myspace.com/markburness
http://www.facebook.com/markburness
Last Edited by 5F6H on Feb 12, 2014 12:39 PM
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arnenym
264 posts
Feb 12, 2014
1:14 PM
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It have two changes from the original circuit made it greater for harp.
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tmf714
2412 posts
Feb 12, 2014
1:48 PM
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The AA/AB763 DOES apply to the Silverface Bandmaster piggyback-I only bring it up because I played through one last weekend-killer for guitar and harp-it also applied to the Silverface Champ, the Silverface Showman and the Silverface Super Reverb- -which I did not play through.
So,in short-yes,it does apply to the Silverface Fender amps mentioned above-
Last Edited by tmf714 on Feb 12, 2014 1:55 PM
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5F6H
1744 posts
Feb 12, 2014
2:12 PM
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Fender kept using AA/AB763 tube charts after the circuits in the amps had changed to SF circuits/gained PO surpression caps. AA763 amps are pretty rare, you'd need to see the PI circuit to identify it. Champs & Broncos were AA/B764, AB763 is a push-pull, LTPI, fixed bias circuit.
Anyhow, we're getting OT now - nice work Arne & Puri!
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www.myspace.com/markburness
http://www.facebook.com/markburness
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puri
140 posts
Feb 12, 2014
4:32 PM
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@Hawk - thanks, and yes, like Mark said - most of the BFs are AB763.
@Mark - I was actually going to write you but I guess I could say "thank you" again here for getting me started! I liked the self split amp but just a few months ago that I've found out that using a small amp was a reason that I've blown out 3 decent harps in a row recently. Kept seeing Greg said that you need big amp got me thinking and then I realised that the sounds that I got in my head are mostly from those big boutique amps anyway so I thought I gotta turn a pony into a horse. luckily that the transformers are already deluxe reverb transformers so I went with Arne's suggestion right away. I'm quite pleased with how it turned out so far.
@Arne, you know, for the second build it was just perfect. A step bigger than my first one so it's not too difficult and I got to learn a lot more than the first time (my friend who helped me a lot with the first one let me do it by all myself this time, he was just giving advice). Also it's actually a good idea to get familiar with AB763 circuit, it makes it easier to move up the BF line later on (my friend is already planning on a Bandmaster)!
Last Edited by puri on Feb 12, 2014 4:34 PM
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Barley Nectar
301 posts
Feb 13, 2014
6:30 PM
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Congratulations Puri, THAT is a Harp AMP! Tell us more about it. Based on a Deluxe, reverb, trem? Mods you did? Any bells, whistles. NFB used? Tubes used? SS or tube rectifier? Chassis used? Did you build the cab? Did you tolex? Open, closed back? How much does it weigh? How long did it take to build? How much did it cost to build, if that is not out of line? Come on, give it up!!!
This is the kind of amp I have been talkin about folks. Big Bold Tone. No wimpy kazoo sounds here. That thing will flood the room with Big Fat TONE. No mic needed, the stage mics will pick it up and make it bigger yet! Ya Baby, nice job brother, sounds awesome...BN
PS: Arne knows his stuff...
Last Edited by Barley Nectar on Feb 13, 2014 6:46 PM
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Kingley
3462 posts
Feb 13, 2014
10:18 PM
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Sounds great Puri, you did a really fine job building it.
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puri
141 posts
Feb 13, 2014
11:02 PM
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Thanks BN & Kingley, to answer BN's questions, it's Arne's idea to take the normal channel of the Deluxe Reverb and turn it into a decent harp amp and it's a brilliant idea!
I remember sometimes ago that there was a thread about the amp that is good for both harp & guitar - this is it (well, one of it). This is only my second build, you're an experience builder - check out the link to the lonewolf thread below to see the schematics & details and compare it to AB763's normal channel you'd understand it right away better than me tryin to explain it to you :) It's sorta like AB763(normal) with Brownface tone stack with Mid & Presence, I also added a bright switch for both guitar & harp.
Tubes are; Brimar 12ax7 (couldn't part with this one - love it), Telefunken 12at7, JJ 6v6s and JJ GZ34. Steel chassis dimensions were improvised on the go so as the cabinet, build it myself with solid pine, dovetail joints, open back. Did the cover myself as well.
It had been a rather slow build for me because it's the first time I did it all by myself apart from folding chassis, I think it took me probably almost a month. I can't tell you the exact cost because I use lots of parts from the old amps & lost track on how much I've spent but it must have been somewhere between 1,000 - 1,500$.
I really do wish sometimes that we have a dedicated amp making thread here. We seems to have lots of experience builders & a few gurus here, it'd be fun to be able to share tips & tricks!
Here's the link to Lonewolf thread
Last Edited by puri on Feb 13, 2014 11:13 PM
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Barley Nectar
302 posts
Feb 14, 2014
10:07 AM
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WOW, you built that baby in a month! I see you used the floating baffle design like a tweed Bassman. I am convinced that this design along with the 11/32" baffle thickness is a factor in the tone of a Bassman. Puri, what is the fabric that you covered the cab with? I really like the look you came up with, the grill works great color wise. The chassis looks cool to. Good eye man. Thanks for the link to LW. Go take a look folks. Very good info and pics...BN
Last Edited by Barley Nectar on Feb 14, 2014 10:22 AM
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walterharp
1318 posts
Feb 14, 2014
10:23 AM
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yeah, the pictures on that thread really bring out how classy looking the amp is
sounds great too.
those guys on the lone wolf amp board certainly are the ones to talk to about building harp amps!
Last Edited by walterharp on Feb 14, 2014 10:26 AM
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puri
142 posts
Feb 14, 2014
6:55 PM
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I think it's linen, at least that's what the shop owner told me. I can't tell you how much I want it covered in laquered tweed but it's just not worth it to order online and get it shipped to Bangkok so I had to come up with something decent. I sprayed the chassis with rust oleum hammered texture one. I can recommend this if you're doing the chassis yourself, thick & classy look, easy to apply(easier than any other spray I've tried), covers minor scratches and it prevents rust. What more can you ask for a DIY chassis ;)
For the cab design I'm a big fan of Fender especially tweed style. I always like the sound of Fender amps and yes I do believe that tweed style construction contribute something to the kind of sound that I like.
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HawkeyeKane
2328 posts
Feb 14, 2014
7:13 PM
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"For the cab design I'm a big fan of Fender especially tweed style. I always like the sound of Fender amps and yes I do believe that tweed style construction contribute something to the kind of sound that I like."
You ain't the only one. Sam Hutton was a helluva cabinet builder. Before he died, Sonny Jr had him build some of the first SJ amp cabs.
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Hawkeye Kane
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Barley Nectar
304 posts
Feb 16, 2014
7:50 AM
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IMO Tweed covering is overated. Fussy to work with, gets dirty fast, the stuff is fragile, expensive, and is way overused. Kinda like Lynyrd Skynyrd, I'm sick of it...
Hawkeye, You should build this amp! BN
Last Edited by Barley Nectar on Feb 16, 2014 11:01 AM
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Kingley
3466 posts
Feb 16, 2014
8:04 AM
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Your amp looks great Puri and it sounds superb.
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HawkeyeKane
2329 posts
Feb 16, 2014
10:58 AM
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Goose, I'm very tempted to!
And on your opinion of Tweed being overrated...if you're just referring to the cabinet covering material, then yes, I kind of agree with you. But the tweed era cabinet construction is superb.
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Hawkeye Kane
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SuperBee
1676 posts
Feb 16, 2014
1:36 PM
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Looks a nd sounds great Puri!
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