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FDP Forum / Amp Mods, Repairs, and Projects / How to enhance low frequencies on the amp?



Dec 21st, 2018 08:03 AM   Edit   Profile  

Hey guys! BB again.

I need some lessons here. My amp (Blues deluxe clone) is too bright, but not just that, it's tone controls seems to not respond very well by tweeking them. First, I've changed the speaker (Jensen Raptor 100W), but even with some improve in the sound, it seemed that it didn't changed that much compared to my old speaker. So well, with my amp open for that speaker swap, i saw that the pots look very cheap (this amp is a clone and also made in China), and it makes sense beeing a very cheap amp. My question in: If a change those pots and also change the capacitors attached to them, can I improve the overall tweeking from it? I mean, how can I be able to really reach all the frequencies that my amp is capable of get?

Thank you guys!

Contributing Member

Results not typical.

Do not try this at home.
Dec 21st, 2018 09:02 AM   Edit   Profile  

Your amp, in its stock configuration, may not be capable of the tone you're looking for.

Changing out cheap components for better ones of the same spec won't do it unless an original component is incorrect spec or has drifted.

The output transformer in a stock Blues Deluxe is fairly small, and that is possibly the cause of your issue with the amp. It's a clone, so the OT is probably similarly spec'd and that contributes to the anemic tone.

You could modify the tone stack to decrease the amount of treble that gets through.

If you're unfamiliar with working on these things, it's a job for an amp tech. It's not worth getting zapped or possibly blowing up your amp.

The first thing I would do is compare the components in the amp with Fender's BD schematic and see if anything is off spec. Being a copy and made in China, anything is possible.

Contributing Member


Dec 21st, 2018 12:45 PM   Edit   Profile  

Have you tried plugging it in to a closed back cab?



Dec 22nd, 2018 10:07 AM   Edit   Profile  

You didn't say what your amp is, so we don't know much about it, we can't find schematics, etc etc etc.

Therefore, we can only speak in broad non specific general terms.

A couple of good non invasive suggestions were made. I'll offer up another maybe cheaper one.

You say your amp is too bright, and/or it may not have enough bass.

After years of dismissing a certain pedal, I've come to really believe in an EQ or graphic EQ pedal. The most popular one is the Boss GE7 (or GE-7). They also make a bass version which may also do the trick for you.

This pedal can do several things for you.
It can EQ your tone.
It can be a treble or bass or mid boost or cut.
It can also be a general boost pedal with 15 db of gain.
There is a trick for it that you can also use it to simulate a dobro sound.

Some of the older ones need an op amp replacement to quiet them down. If you have basic pedal modding skills it's easy. You don't need to buy a kit from anyone. Get three op amps and sockets for them and in about an hour you'll be back on line.

The particular pedal that you have in hand at the time will determine if you can do the mod, and/or what ICs to actually replace. For the one I was dealing with I only was able to and felt comfortable replacing three of the ICs. When it was over I was stunned at how much more quiet it is. Some of the newer ones supposedly already have the ICs changed out.

I have seen these advertised for ridiculous prices on the local Craigslist. Being the patient bottom feeder that I am, I managed to pick one up in beat but functional condition for $12. There's one locally that I don't need, but is going for $35 that I'm thinking of picking up as a gift for someone.

I have heard that a very good alternative to the Boss is a Danelectro Fish and Chips. It is much cheaper and supposedly is every bit as good and is quiet. Some people say that they are not as rugged, but it is probably good enough for 99% of users.



Dec 23rd, 2018 06:12 AM   Edit   Profile  

Hey guys! thank's for all the answers till now. First of all:
Peegoo - That's exactly what I had in mind. I'm thinking of changing the components specs and since i'll have to change them, I'd put some good stuff there with those new specs. I forgot about the OT, it is a good sugestion and kinda easy to change it, since is a simple circuit (kind of).

Leftee - Never tried that, I could try that for sure, but I'm pretty sure that the problem here tends to be for it's tone stack.

Ejm - The model of my amp is called Superblues AT 30. In China it is from a brand called Goldea. There's many brands around the world that take the same amp and just change the name, such as "Vibe amps" or "Strauss amplifiers". I didn't share the schematics because there is nothing on the internet about it. But, your idea about the EQ pedal is very good! I must confess that I've always refuse thta pedal, but it can be a very cheap solution for my problem for sure! I've found a Behringer model that seemed pretty good too

Contributing Member


Dec 23rd, 2018 06:42 AM   Edit   Profile  

Re: closed back cab. It’s worth a try. There is some phase cancelation in an open back cab that reduces the bass.

But it is interesting that your tone controls seem so ineffective.

The EQ pedal is also a very good, non-invasive option.

(This message was last edited by Leftee at 08:44 AM, Dec 23rd, 2018)



Dec 23rd, 2018 06:46 AM   Edit   Profile  

I've took some photos of the internal circuit. The values of the caps seems to be on the other side, but any help here is valid.

Thank you guys!




Jan 4th, 2019 02:15 AM   Edit   Profile  

Shotgun part replacement is kinda haphazard. cheaply made amps are easily damaged by incompetent / inadequately resourced repair.
If an amp is suspected of not working correctly, it would be better to verify its operation at high signal level on a test bench, check its test points against the schematic, or failing that, try swapping a known good tube of the correct type into each socket in turn.

(This message was last edited by pdf64 at 04:18 AM, Jan 4th, 2019)

FDP Forum / Amp Mods, Repairs, and Projects / How to enhance low frequencies on the amp?

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