How to add Midrange Boost to Fender tube guitar amps Easy method fully reversible Quick Install
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- Опубліковано 7 жов 2024
- A nice addition to your Vintage Fender amplifier. In this example, D-Lab modifies a 1964 Black face Deluxe Reverb. The owner had already disabled the AC polarity switch, so that was the chosen location for the new control. Parts for this update are readily available thru common suppliers.
Thanks Terry and Tony. Appreciate all you do. I fixed my '69 Vibro Champ from watching your videos. About 25-28 yrs ago someone put foil in the fuseholder and it sparked out the death cap while I was downstairs and I laid it aside for junk, but didn't toss it, or my other amps as I grew up, saving them to someday fix. Well, I started watching your videos last year and I fixed it and also my Marshall 5210 (solid state), and a couple others are back from the dead. Also, I build a Marshall Bluesbreaker Pedal because YOU and Uncle Doug are so patient and sharing with the information. All those extra details you guys have taken time to give in the videos has paid off for me. I remember wanting that pedal as a teenager. Thanks again for the good tips and you and Tony have a great week.
Thank you Terry for this video! I will use this down the line. One thing that you did which I'd never seen before is
you ground down the spot where the resistor will be soldered on the chassis. It makes sense to do that ... but I'd never
thought of it and never seen that done. You didn't mention it on the video, but I saw the before and after ... where the resistor
was soldered to the chassis. It's little tips like that which helps us learn the best way to go about repairs, restoration, and mods.
Great sound, great tech, great neighbour.🙂
The best mod for any fender amp without a mid control. Tony said it's like a boost. That's because it increases gain by taking out the tone stack. Kind of like the raw control on amps.
Got one on my '77 Deluxe and it's a nice addition. Very nice playing. Tony has really gotten good.
These are the kinds of things I love Terry to show us. I hope he does more of these with other fenders:)
I couldn't really hear it on the video, but after putting it into my Deluxe circuit...WOW! Huge difference...nice smooth mids! Thanks for this! Bought a cheap pot on Amazon, and now waiting for an Alpha to get here. Not sure I want to do the final mod after a glass of pinot, but maybe do the mod first...just sayin'. 🙂
Higher end Fenders like the Twin Reverb have a 10k analog taper pot for the mid control. At 5 on the knob the resistance to ground is about 1.2k ohms. If you like a John Mayer style sound with less mids it would be handy to be able to dial this mod all the way down, rather than having the 4.7k R limit the range. If you still want lots of boost you could use a 50k analog pot, or even 100k, which I've seen done. Basically that removes most of the load of the tone stack so you hit V2 with a lot more signal.
Wow Terry... what a difference that makes.. and I hear it on video. Well done.... really cool design and solution as always.. D-Lab Rocks !!
YEAH! Tony at his best. NICE design/implementation.
i added a similar mid range boost that
Doug Roccaforte wrote about in Tone Quest magazine several years back. i think it works well. thanks for the updated info, Terry. i'm a fan...
Great showcase Terry, and great selection for the values! Love the playing Tony!
More like a variable mid cut. It's not really boosting but giving you back a bit of what fender cut out
I'd love to hear what it does with a guitar which has humbucking pick ups. Tony's tele's and strats are brighter, thus presenting the midrange from this specific.
Interesting! This gives the tear-your-head-off mids and boost of a Twin on a smaller amp.
Nice! And a very easy mod. Simple to reverse. Well done!
Nice job Terry, sounds great. 73, de W1SEX
Sounds terrific!
There is a tone stacking program free on line that shows what happens when you change the components in the signal path, guys? Pretty easy to understand to!
Very cool Terry!!
That sounds fantastic 👍
It’s one of the reasons why I really enjoy lower graded tubes from EH’s Tung-Sol line. Weaker graded tubes just were made for the blues. A great tube supplier will be happy to sell them to you as a matched set. What surprises me the most Terry, is how this all works out in the end.
Love the mid-pot mod.
Terry, what’s your current go to for current production 6V6’s in a high plate voltage 65 Deluxe Reverb amp?
Love it. Thank you!
I think I like the amp unboosted best myself. But that amp does sound nice.
Fantastic and serendipitous! I have my Deluxe apart for recapping and why not fix that mid scoop while we’re in there? Thanks again!
Good tip! Thank you
great stuff here, it would be cool if you showed how to make a "jose mod" (pre/post eq master volume and adding another tube stage gain) to a marshall amp
Check out "Head first amplification" 's channel......he has several videos on the Jose mod, and lots of marshall stuff.
The larger Fender AB763 Blackface amps use a 10k midrange pot. I include that in my smaller amps. I have not tried the much higher value you are using. Would be interesting to hear the comparison.
The larger values are ok with newer speakers, but I like the old Oxford 12K5 or Jensen C12Q/K tone. I just install a 10k resistor on the pots.
I guess I don't hear any difference. Terry should be rotating the pot while playing to actually hear what's changed. Suggestion for the next time.
Can you show how to add a mid control on this amp so it can then have TMB tone control?
fabulous! but I would have placed the control at the front, instead of the rear.
I've been told, I already have enough "boost" in the rear, most of the time, it's all about the bass!
For one reason maybe two I'm keep watching ur videos so a I have few questions do u have any phone shop where I can call you.. thanks exelent videos.
Great mod Terry and an insight into the meat and potatoes of the Fender middle control
BUT, is calling it a "boost" really accurate? ...thanx guys
Works just as well with the resistor soldered to the case of the pot and then you dont add any solder to the chassis!!!!!
Terry, where is your skirted Fender knob? That would make this mod PERFECT!
Mids are all the rage today.
Nice. I have a 65 bandmaster. I've been meaning to do this for a while. Have you done a video on removing the death cap? I had my 2 prong replaced years ago, but it looks like the death cap was left in, and it has the ground switch, but I can't remember if it's just disconnected. I never touch it.
Hi Terry,
What's the purpose of soldering the ground of the coax to the back of the bass pot but not using the ground at all on the other end?
So you lost me where you're potting the contacts removed from the ground switch? Where did you run them to?
Do you lose bass ?
I didn’t know mil house dad played guitar
Sweet. Petite.
Great video. where can I get that exact G174 coax? thank you
Hopefully you have found it by now, but for those reading this who haven't, I got it off Amazon. Its actually RG174. I'll bet McMasters carries it as well. Cheers
but that is always where I put the reverb dwell
Could this mod be used on other amps that have a treble and bass pot in the circuit?
i'm a fool for your stockings I believe...
Cab this mod be done on both channels? Or, is the mod universal to both channels?