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No reverb on fender frontman 25R

No reverb! the reverb dial very slightly changes the tone of 'hiss' that is produced when speaker is at a high volume, but there is no sign of any reverb at all.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

robotek
  • 1512 Answers

SOURCE: fender deluxe reverb

Hi Hoopnholler

I would start by changing out 12AT7 (V4), is a common buffer stage to the vibrato and reverb audio path. If you have trouble identifying it, you can just swap out with a known good tube and see if it resolves your problem.
If that does not help, then time to go see an amp doctor. If youy are inclined. here is a circuit diagram that you may find useful in faultfinding the problem yourself.
.
I am more than happy to answer any other questions you may have about it, just give me a hoy :) If you are still unsure, or have problems, then before you give a rating for this advice, please get back to me and we can try some more things.
Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

regards
robotek

Posted on Jun 19, 2008

  • 5603 Answers

SOURCE: i tune on my frontman 25r and when I input I dont

It sounds like a failure in the preamp stages, but fortunately you can do a lot of troubleshooting externally.

Drive the "power amp input" jack with another source of audio that has some reasonable output... like a small CD player. If this works (no mind the level, just the quality, that will verify if the power amp is OK.

If the power amp is OK, the use the preamp out to another amplifier.

If it is OK, then the Power amp input jack switch MAY be bad, When nothing is plugged into these, the preamp is sent to the power amp by a switch on the power amp input jack.

If you do these tests, you can email me the results and I will give further tests to run.

Posted on Nov 19, 2009

  • 5603 Answers

SOURCE: Hiss in new fender frontman 65R

A certain amount of "hiss" is present in electronic amps due to the statistical noise in electronics.

The hiss should be WELL below the level you get when playing. If you put you ear to the speaker, expect to hear some hiss with nothing plugged in. Ten feet away it should be very faint.

Posted on Dec 31, 2009

petraman7
  • 1175 Answers

SOURCE: Fender frontman 15b will not power up.

Hi...

There's a power output IC ( circuit) mounted to a small heatsink inside.
These are known to go bad...something like TDA 3020 on the part maybe?
It has 5 pins

You can get them at digikey.com

or

mouser.com

Posted on Apr 14, 2010

  • 5603 Answers

SOURCE: I have a Frontman Fender 25R, it has a power, the

You actually have the "B" version as the original 25R doesn't have RCA jacks. Anyway, on with your problem...

I want you to do a test: With a set of headphones plug them into the preamp output and then play your guitar... don't expect much loudness, it may be very faint and will ONLY be in one of the sides of the headphones. This tests the preamp section... have the guitar volume wide open.

IF you can hear the guitar that way, then the switch contact on the PA INPUT jack (not the preamp output) is not making contact. These jacks are really poor and the problem is not that uncommon. Fix is to open the unit and increase the spring tension on the contact or replace the jack. Never use the jack as they worsen evertime you plug something into it.

Note that the failing switch symptom MAY be broken soldering in the vicinity of the jack so look for that also. And also check the soldering of the guitar input jack as that is a common problem. Always loop your guitar cable through the handle so tripping over the cable doesn't break the jack by yanking the plug sideways... another common problem.

Posted on Mar 25, 2011

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Here is a link to the schematic drawing
http://www.prowessamplifiers.com/schematics/fender/ps160.pdf

items to check are
1-the footswitch and plug
2-the reverb unit ,usually found at the bottom of the box
3-the reverb unit is plugged in to the amp
4-V6 a 7025 valve
5- the reverb switch is in the on position

Hope this helps

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I have a fender frontman 65r with a 8ohm speaker can i add another 8ohm speaker to this


http://cie-wc.edu/Series_Parallel_9_14.pdf
Not recommended.
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Can't Replace Speaker in Fender 25r Frontman


This is a pain I know. First clean off the locking goo that started the problem. I am surprised you are changing the speaker. They rarely go bad, but the amp chip in these does go bad. To remove the screw you need to slot the flat head. Use a Dremel tool with a little cutof wheel to grind a slot into the flat. NOW to remove the nut with remaining goo, use a soldering iron to heat the screw in place before trying to remove the nut. When replacing the nut, don't forget to paint the head of the screw so the slot doesn't show AND "chase" the threads so nut will go on freely.

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I have a Frontman Fender 25R, it has a power, the auxilliary input is working (the RCA, red and white ) sound is produce, when I plugged an electric guitar on the 1/4 input there is no sound coming...


You actually have the "B" version as the original 25R doesn't have RCA jacks. Anyway, on with your problem...

I want you to do a test: With a set of headphones plug them into the preamp output and then play your guitar... don't expect much loudness, it may be very faint and will ONLY be in one of the sides of the headphones. This tests the preamp section... have the guitar volume wide open.

IF you can hear the guitar that way, then the switch contact on the PA INPUT jack (not the preamp output) is not making contact. These jacks are really poor and the problem is not that uncommon. Fix is to open the unit and increase the spring tension on the contact or replace the jack. Never use the jack as they worsen evertime you plug something into it.

Note that the failing switch symptom MAY be broken soldering in the vicinity of the jack so look for that also. And also check the soldering of the guitar input jack as that is a common problem. Always loop your guitar cable through the handle so tripping over the cable doesn't break the jack by yanking the plug sideways... another common problem.

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I've told my Frontman 65r has a real reverb tank (accutronics). But it's almost imperceptible, even with the reverb knob at 10. Is that normal? Also, mid scoop for the drive channel and treble/bass for the...


The reverb should be quite strong. I would first look at the reverb volume pot R42 which is a 50K pot. I would also check the voltages on the test points near U4 (TLO-72 op amp tp13 and tp14) which amplifies the signal coming out of the box. It is possible the box has low power levels as well.
The problem is going to be around that section of the board if it isn't a dirty or dead(ish) pot.


The reverb should be noticeable enough to be annoying ;-]

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When I turn on the amp, I get a loud hum. plugging into the jack doesn't change anything. turning the dials doesn't change anything. when I turn off the amp it makes a loud crack.


i) Disconnect one lead of loudspeaker & insert an open-ended guitar cable into headphone socket.

ii) Put a dc voltmeter across open end jack then turn Frontman ON for a few seconds.

iii) The reading should be about 0volts - if the voltage is high (27v), then it is likely that the PA chip TDA1514A has blown.

iv) If,however, the voltage is correct in iii) , then reconnect speaker & put guitar cable into the POWER AMP IN socket & connect other end to guitar...Turn on briefly, if there is still hum then fault is in the output stages & will require chassis removal to solve.

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1 Answer

Hiss in new fender frontman 65R. Can't seem to dial it out in either input.


A certain amount of "hiss" is present in electronic amps due to the statistical noise in electronics.

The hiss should be WELL below the level you get when playing. If you put you ear to the speaker, expect to hear some hiss with nothing plugged in. Ten feet away it should be very faint.

Dec 30, 2009 | Fender Music

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