Fixr1984

I've been messing with Duncan tone stack calculator just to see what values would work best without messing too much with the bass and treble as well. Seems to me that in some cases a bass shift control might be useful. I have the room to add it as well as the components to make it work so I just might give it a try. Any other thoughts on that idea?

Peter

Hi, all, I have been away. Since returning, I managed to improve my AVT50 mods some more, and came up with some new mods for the future. I am making my kits compatible with upcoming mods as well. I'm currently shopping around for a second AVT50 to try out my kit before sending any out. Best wishes.

PETER

joelschaos

Hey is anyone gonna post instructions on how to perform these mods yourself? I am mostly interested in adding the mid eq control on the clean channel. Any info would be much appreciated...

Arcarix

Peter, I am definitely interested in buying your mods when you are ready to sell them.
I'm about to replace the current 8 ohm speaker i used to replace the stock speaker. 4 ohm 12" spkrs seem to be difficult to find, however I have found a source for Jensen C12-N spkrs.

I e-mailed the owner asking if it was a good fit for the AVT-50, and here is his reply (I'm not affiliated with these people, and havn't even bought the spkr yet so I don't know how they sound)...

"hi, i found the C12N-4 to be a perfect speaker for that amp.
dont be fooled by the cost... this is a really articulate musical instrument speaker.

here is the link... feel free to log in and use the shopping cart to calculate your exact cost to your door please:

Jensen C12N-4 - VintageSpeaker.Com

ps we only take PayPal or Money order, we are a distributor.

thanks in advance,

Joseph A. Scinta
President KEN-TON Electronics Inc.
187 Greenacres Rd.
Tonawanda, NY 14150 (716-837-9168)

PRODUCTION Facility:
KEN-TON ELECTRONICS INC
2256 Sheridan Drive
BUFFALO NY 14223 (716-875-5114)

VINTAGE SPEAKER LOGIN

Main Phone: 1-(716)-837-9168 Fax: 1-(716)-833-3319j"

Peter

Arcarix, I am interested in hearing your opinion on the Jensen you are buying, as compared to the stock speaker. Incidentally, I just had to troubleshoot my AVT50 - I thought my mods had possibly added a slight buzzing to the clean sound, but it turns out the speaker was the problem. I determined this by connecting the speaker to another amp, which resulted in the exact same buzzing. I suspect something is loose in the voice coil. I hope I can fix my 4 Ohm Celestion G12M-70, because it is really good in this amp. I hope to hear from you soon on the speaker topic. All the best.

Peter

Arcarix

Sure thing Peter. It'll probably be 2 weeks to buy & install the Jensen, then A/B the two for a week. I'm hoping for a kind of half Marshall/half fender tone to use with my strat. I'll keep in touch.

Arcarix

Hi! Jensen C12N-4 got here about 2 hrs ago, it's installed, and I'm hype'd! It sounds GOOD!

I tracked on UPS and had the EMI RW&B removed before it got here, went to the computer & refreshed the screen, it said it had arrived, so I opened the door, and sure enough there it was! Took less than 15 min. to mount (versus 1 hr for the Eminence) T-Bolts just went right on in ! Anyway, plugged the strat in straight to the amp, clean chan
gain at 9 o'clock, vol @ 12 o'clock, tone @ 12 o'clock, and just played some of my usual noodles. The tonal difference was amazing. Very nice clean rounded tones, very well balanced tone range across all positions of the pickup switch, amd frankly I am impressed!

I have not pushed the volume up yet, and have not used the gain channel yet (I live in an apt. building and work 3rd shift so I have to pick my times to play loud) but I will update this soon.

As of now I am very pleased with this speaker. It does have the 'halfway between Marshall and Fender' tone I was looking for, at least at this volume level. Further testing will of course be required.

For now, I'm one happy camper!

Arcarix

Update - Having played thru the Jensen more, and at higher volumes, it still sounds fantastic. The original stock speaker sounded just OK at first, but then quickly began to sound like a transistor radio speaker, if you know what I mean. It just sounded kinda 'cheap', like they put a speaker in the amp just because they had to. So I replaced that with an Emminence Patriot series 'Red, White, and Blues'. Unfortunately that spkr is 8 ohms, and rated for 120 watts. This amp is rated at 4 ohms, 50 Watts, so it lost some of the rated power driving into 8 ohms, and never really got pushed by the amps 50 watts which resulted in a ultra-clean sterile sound.

So after installing the Jensen C12N-4 a friend of mine comes over to jam, and this guy already knows I mod my Strat a lot, but I didn't tell him about the speaker change. We start playing the usual stuff, and when we take a break he says "What did you do to the Strat this time, it sounds really good". He says "It sounds warmer, and I can hear all the notes." So then I told him "Nothing to the Strat, changed the speaker in the amp."

Point is, it's not just MY ears hearing the improvement, or just me wanting to hear a change, it's an actual, noticeable difference, and for me, it's a good one.

So far I've cranked only the Clean Channel using a modded TubeScreamer, Boss PH2 SuperPhaser, and Boss DD2 digital delay with slight reverb from the amp. All the effects worked as expected, and were added one at a time after checking the totally clean sound. It all sounded really good.

Rent has just been paid, so in a couple of days I'll check out the OD channel, but since I'm really not much of a heavy metal player anyway my opinion of the sound quality of this spkr for that type of sound may not be of much value.

Please note that I'm not affiliated with the seller of this spkr, I just couldn't find any other 4 ohm 12" spkr anywhere, and all this LONG post is just my opinion, of course your mileage may vary.

As an afternote, I'm very lucky to have long suffering neighbours in my apartment building, and a beginner guitarist in another aptartment who plays LOUD, so when I play loud they are thankful that it's not quite as awful

shoelace

Hi,
I'm new here so sorry for the dumb question, but Peter, have you uploaded the schematics of your mods or not? Cause I didn't see them there but I'm dying to try them out.

holycowbatman101

I don't think he has .

Fixr1984

Here is a pic of my head. I did it awhile ago and thought I would post it.
The 2 controls on the far right are mid shift and bass shift for the OD channel.
I also added footswitchable gain boost.

shoelace

Won't you like to share that with us?

Fixr1984

Sure, its pretty simple.
Take out C78 (bass cap) and C79 (mid cap). Replace those with wires. I used a little hot glue to keep the wires from bending too much and possibly breaking a trace.





I made a small circuit board to mount all my capacitors to. I Have 2 rotary switches mounted to the front. I used a 6 position for the mid and a 4 position for the bass.




Next step was to wire everything up. Little messy with the wiring but overall it worked out.

shoelace

Thanks a lot Fixr I would gladly try this out, if you could only give me amount of caps needed (sorry for my English). And if it isn't a big deal for you, could you make some sound clips?

rockinr0ll

What is a mid and bass shift? BTW it looks very clean to me who isn't a mod expert.

Fixr1984

I used 10 caps. 6 for the mid (one is a stock value) and 4 for the bass (one is a stock value).

Let me set my stuff back up and I will see about sound clips.


@ rockinr0ll. When you adjust the controlls on the EQ you are adjusting within a certain limit depending on what value capacitor you have. By adding different values on a switch you can basically "shift" the adjustable range of your EQ adjustability.
Not the best answer I suppose but I hope it helps explain a little.

shoelace

ok thanks, I'll be waiting but you still didn't say what amount caps you've used

Arcarix

Hey Fixr1984, that looks great, and easy to do also. By the way I believe shoelace is asking for the values of the caps you used, not the number of caps. Anyway looks like a nice neat install to me.

Fixr1984

Still working on the sound clips.
To make it easier here is the layout I used. C2 is the stock mid value
and C7 is the stock bass value.

rockinr0ll

I can't wait to hear this thing!

Fixr1984

I havent forgotten, just having problems uploading at the moment.

shoelace

Still waiting

Fixr1984

Alright I tried to keep it simple. Playing is crappy, mic was crappy. Bass-5 Mid-0 Treble-5
You can hear when I change settings while the last chord is ringing out. This is the mid shift only I left the bass setting stock.



http://soundclick.com/share?songid=7419002

rockinr0ll

Cool, sounds a lot like when I add my eq to the amp. Are you going to do any more mods?

Fixr1984

I would like to improve the gain boost. At higher volumes it's not as noticable.
Other than that I'm not really sure what I would want to change.

shoelace

nice mod but actually what I'm interested in the most is how to get rid off the buzz, which i like to call "the box effect" on the drive channel. Does anyone have any ideas where the problem might be?

RoydRage

I'm WIDE awake Peter, I just read this now, and joined the forum because of It!

I have the AVT150H, with a 1960vintage Cab, and I love it!!! Very tube like!

I would like a little more GAIN, and a Heavy Weightier Sound, could you detail what exactly I would have to change for the tube mod, and tone mod... Not interested in having it pedal switchable..

Thanks,

Royd

RoydRage

So...

I see Peter is MIA?!?

Does anyone have the details/diagrams for the gain, and tone shift mods that they can share

I want to get this implemented ASAP

Thanks,

Royd

rockinr0ll

He never gave any info... But a couple posts ups there is the bass/mid shift mod. I would suggest just getting an eq and putting it in the loop. That's what I do.

Fixr1984

These mods are for the AVT50. You said earlier that you had a AVT150. You could compare schematics to see how interchangable these mods would be.