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Amplifier TOO loud
Amplifier TOO loud
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Old 5th October 2019, 02:09 PM   #1
Vilinova is offline Vilinova
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Default Amplifier TOO loud

Hi All,

First time posting and new to the DIY scene, so hopefully someone here can help me out!

I've 'successfully' built my first amplifier at home (just the basic starving student with 19J6's), but am running into an issue with the volume of the output.
I've got 50 OHM impedance headphones hooked up and have lowered the volume to about as low as it can go.
I find that even at the lower volume settings (not even a 1/4 of a turn around the pot.) can I handle the sound generated.

Any suggestions to maybe taper or modify the output?


Side note, I believe that the pot could possibly be wired backwards as right is low and left is high.
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Old 5th October 2019, 02:19 PM   #2
Mooly is offline Mooly  United Kingdom
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Amplifier TOO loud
Welcome to diyAudio

It does sound like your pot is wired backwards if it is working in reverse, and given that most volume controls have a logarithmic law this error will compound your issue.

So first thing is to wire the control correctly. Make sure the middle pin of the control goes to the amplifier input as you can still get a control to work if that is wrong as well.

If the middle pin is correct then simply swap the two end connections around.

See if that fixes the issue. If it's still to loud then you have two choices:

1/ Add an input attenuator which is just a series resistor in line with the feed to the input of the pot (not the middle pin ).

2/ Add an attenuator at the headphone output using an 'L Pad' attenuator which is nothing more than a divider using two resistors.
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Old 5th October 2019, 02:20 PM   #3
JMFahey is offline JMFahey  Argentina
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1) you need a Log/Audio pot there.

2) if wired backwards itīs *uncontrollable*.
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Old 5th October 2019, 02:26 PM   #4
daemonsgr is offline daemonsgr  United Kingdom
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is this the first headphone amp that you use only at low volume?
If you are young and/or havent abused your ears, low volume might be ok for you.

I never use any if my HP apms louder than 10-20% of the pot.

of course the technical comments above need to be investigated!
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Old 5th October 2019, 02:55 PM   #5
Vilinova is offline Vilinova
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Ok, so a little digging and some solder fumes later. I've switched the connections.

To really not much change, except it's a little worse now.
Now left is the 0 and right is full gas, but it ramps up quicker.
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Old 5th October 2019, 03:34 PM   #6
Vilinova is offline Vilinova
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OK!
Fixed, thank you guys for the help. I realized after examining for a few mins that when I had re-soldered to switch the ground earlier I had to de-solder pins 2 and 5 for cable management and got them switched with 1 and 2 on the re-solder.

With that, it completely fixed the issue. Huge shout out to the forum for helping to solve this issue

Thank you!

Off topic question though, I got a hold of an old AM/FM radio player with an assortment (6) of hopefully good tubes. (6A8, 2x 6K6's, 5Y3, 6SK7, and 1 I can't make out)
Are there any good suggestions to testing tubes or a tester that would cover all of these?
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Old 5th October 2019, 04:30 PM   #7
sgrossklass is online now sgrossklass  Germany
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Quote:
Originally Posted by Vilinova View Post
Off topic question though, I got a hold of an old AM/FM radio player with an assortment (6) of hopefully good tubes. (6A8, 2x 6K6's, 5Y3, 6SK7, and 1 I can't make out)
Are there any good suggestions to testing tubes or a tester that would cover all of these?
The tube subforum may be of more help there.

That said, this tube complement doesn't sound like your average All-American Five. What you've got there may be older and more collectible than you think, and as such possibly worth restoring. These are rather old types, most commonly used in the 1940s.
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Old 5th October 2019, 04:39 PM   #8
Vilinova is offline Vilinova
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Uh.... So doing some digging you are correct.
Crosley Model 24AJ... dated 1941. It's in terrible condition sadly, and none of the important bits are together....

Thanks for the heads up!
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Old 6th October 2019, 01:46 AM   #9
PRR is offline PRR  United States
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> doesn't sound like your average All-American Five

Cuz it is a seven tube. With power transformer! Field-coil speaker.

$29.95 new, 8-inch speaker.... this was an expensive table radio!

6A8GT (converter) 6SK7 (IF) 6SQ7 (1st audio) 6J5GT (phase inverter) 6K6GT 6K6GT (power bottles) 5Y3G (rectifier)

This front-end line-up (in 150mA form for 5-toob) was introduced late 1939. The radio is 1941. With an extra big tube, and a PT, it runs all 6V tubes.

Last edited by PRR; 6th October 2019 at 01:54 AM.
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