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Post subject: Re: feedback from reverb in frontman 25r
Posted: Sun May 18, 2014 3:40 pm
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bluesky636 wrote:
TC5A wrote:
OT post, since we got the 25R guts out, I was pondering the idea of having a point to point version of the 25R built (only the clean channel, no hi gain section, no aux in or headphones out).

Anyone would care to advise on the best way to go about this and what might be the cost to build this? I would get a new chassis and cabinet to put the circuit in. The 25R clean channel sounds fantastic but I'm concerned about the durability of the thing, considering the low price. If I could get a top shelf version of this circuit made this might be my ultimate amp.


Absolute waste of time and money. There are plenty of real amp kits available that are easier to build, sound better, and are worth more in the long run than trying to copy a 25R circuit.


Any specific kits you recommend (for the best clean tone)?

What I like is not only the clean sound but the EQ is also remarkably good. The bottom end I get out of the 25R is pretty amazing. What I don't like is that the amp is noisier than I would like. I want a solid state amp. I got tube amps and this little guy gives me the best clean tone. Incredible for the price.


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Post subject: Re: feedback from reverb in frontman 25r
Posted: Sun May 18, 2014 3:50 pm
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https://www.google.com/search?q=solid+s ... channel=sb

I only build tube amps.

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Post subject: Re: feedback from reverb in frontman 25r
Posted: Sun May 18, 2014 6:02 pm
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bluesky636 wrote:
There are plenty of real amp kits available that are easier to build


As you've had a good look at the 25R would you say that the (clean channel only) circuit would pose a particular challenge to copy?


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Post subject: Re: feedback from reverb in frontman 25r
Posted: Sun May 18, 2014 6:53 pm
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TDA1514A power IC: http://dandini.wordpress.com/2010/10/22 ... ir-issues/

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Post subject: Re: feedback from reverb in frontman 25r
Posted: Sun May 18, 2014 7:05 pm
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I see. So this component cannot be upgraded or substituted with a discrete circuit? I'd assume a point to point version would be all discrete circuit.


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Post subject: Re: feedback from reverb in frontman 25r
Posted: Sun May 18, 2014 7:10 pm
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Like I said, I build tube amps. I really have no interest in continuing this discussion. If you are hell bent on wasting money on this project, do some research on your own. Good luck.

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Post subject: Re: feedback from reverb in frontman 25r
Posted: Sun May 18, 2014 7:23 pm
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Sorry to waste your time sir.


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Post subject: Re: feedback from reverb in frontman 25r
Posted: Sun May 18, 2014 7:48 pm
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It is clear from your questions that you have no clue what it takes to design and build an amp. Do you have any idea what the circuitry is inside an integrated circuit looks like? Are you looking for someone to design an amp for you for free? It sure seems that way. Maybe you should start by studying some basic electronics books and then looking at books on amplifier design. Amazon carries quite a few. Then you will realize that what you propose is sheer folly that would cost more than the stock amp and have no guarantee that it would do what you want.

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Post subject: Re: feedback from reverb in frontman 25r
Posted: Sun May 18, 2014 8:23 pm
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bluesky636 wrote:
It is clear from your questions that you have no clue what it takes to design and build an amp. Do you have any idea what the circuitry is inside an integrated circuit looks like? Are you looking for someone to design an amp for you for free? It sure seems that way. Maybe you should start by studying some basic electronics books and then looking at books on amplifier design. Amazon carries quite a few. Then you will realize that what you propose is sheer folly that would cost more than the stock amp and have no guarantee that it would do what you want.


Of course I don't know how to design an amp circuit otherwise I wouldn't be asking these questions would I? I'm not a tech. I was asking what might be the cost to get this done (by an amp tech).

Anyway, I'm not here to have arguments with people, I'm here to have friendly discussions about guitar gear.


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Post subject: Re: feedback from reverb in frontman 25r
Posted: Sun May 18, 2014 8:31 pm
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TC5A wrote:
Of course I don't know how to design an amp circuit otherwise I wouldn't be asking these questions would I? I'm not a tech. I was asking what might be the cost to get this done (by an amp tech).


Bill is an amp tech (and substantially more) and he's telling you there isn't anything -- ie: NO THING -- in a Frontman 65R that's worth recycling into a new amp project. Better to start with a clean slate and a quality amp kit than to flog the dog you currently own (or any of its fleas).

Arjay

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Post subject: Re: feedback from reverb in frontman 25r
Posted: Mon May 19, 2014 4:13 am
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Retroverbial wrote:
Bill is an amp tech
Arjay


Yes I figured that.

I also fully realize that the 25R is at the exact opposite end of the spectrum from prized vintage amps. It's a dirt cheap $99 amp! Technically I guess it's just a cheap toy. But why does it sound so good? Anyway, you don't have to answer that.

I will not carry on this line of discussion, lest I'll be accused of trolling.

Best wishes to all.


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Post subject: Re: feedback from reverb in frontman 25r
Posted: Mon May 19, 2014 6:53 am
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Just to complete the thought. I know of no 100% solid-state DIY kits for either guitar or hi-fi amps. There are a LOT of tube and hybrid kits. Hybrid kits having pre-built solid-state boards.

In any event, the only "DIY" stuff that may work is the switching of appropriate gain stage/EFX chips in the amp. Any output stage mods would require knowledge in setting bias, DC offset, etc. I recommend not doing these types of mods.


http://music-electronics-forum.com/t21760/


http://www.diyaudio.com/forums/solid-st ... ch-ok.html


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Post subject: Re: feedback from reverb in frontman 25r
Posted: Mon May 19, 2014 8:01 am
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bluesky636 wrote:
It is clear from your questions that you have no clue what it takes to design and build an amp. Do you have any idea what the circuitry is inside an integrated circuit looks like? Are you looking for someone to design an amp for you for free? It sure seems that way. Maybe you should start by studying some basic electronics books and then looking at books on amplifier design. Amazon carries quite a few. Then you will realize that what you propose is sheer folly that would cost more than the stock amp and have no guarantee that it would do what you want.


If you are drinking right now, you should stop. If you're not drinking, you should start.


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Post subject: Re: feedback from reverb in frontman 25r
Posted: Tue May 20, 2014 12:49 pm
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horax wrote:
Just got an awesoem little amp...frontman 25r in red. I love it so far for what it does and what it is supposed to be.

However, I have found that the reverb is feeding back anytime I have it turned up past 3.

Why do I have it past 3, you might ask? I play surf! I do'nt ahve it to 10 as that is just way too much to sound clean...so I usually play at 8. However, during testing for feedback, if I set reverb to 0, it goes away. Any time it's past 3...feedback occurs.

Anybody experience this or know how to fix it? It's only 2 days old. :)


Turn off the amp reverb and check out the BOSS FRV-1 Reverb pedal. Pricey but sounds good. Or you can be like me and use an analog delay pedal. Not really quite as surfy, but still fun.


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Post subject: Re: feedback from reverb in frontman 25r
Posted: Tue May 20, 2014 6:58 pm
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Check out the The Newcomer's Forum over at Solid State Guitar Amplifiers.

They're decent folks over there who won't jump down your throat just because you're not a tech.

One of the members wrote a book (click me) on solid state guitar amp design. It's absolutely free.

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