Do you have a schematic? It may be that the performance problems you're having are unrelated to the brand of the capacitors.
For such an artistic styled amp; What's that unbolted bridge rectifier (at 10' oclock) flying in the wind ? I can't quite see if the can electrolytics have mounting clips, are they any ?
The rest seems quite tidy with screws and washers.
You need to tell us what "sounds wrong" to make an improvement. Youv'e even got gold plated output posts....😡.??? what more ?
Got a spec sheet ?
richy
The rest seems quite tidy with screws and washers.
You need to tell us what "sounds wrong" to make an improvement. Youv'e even got gold plated output posts....😡.??? what more ?
Got a spec sheet ?
richy
the scr pp are not so good in signal path, the low price claritycaps can be a good start , russian teflon ft3 too....
I get the feeling the picture isn't telling us the whole story.
A pretty amplifier, PP EL84 -- what are the driver tubes? And since P-P construction much easier to work on.
The coupling caps are SCR, (ie the same as the cheap Solen poly caps), and marked in the attachment. They are usually the 1st thing replaced when talking about better caps. After removal, they can be used as bypasses on the power supply elcos.
Do keep in mind that cap prices do not directly correlate to quality, that higher cost ones are usually bigger (make sure they will fit). I've found Brian Cherry's (diy hifi supply) Obligatto caps to be good bang for the buck, and until such time as much of the rest of the amp has been replaced, not the weakest link.
dave
Attachments
the schematic for the amplifier.
Hi, this is the schematic for the amplifier, I hope it can help us. In fact, This amplifier is suitable for the youth because it fashionable and the sounds it is soft. And I want to upgrate it by myself, I hope the bass can be deeper. but I know what component should be replace? Best regards.
Hi, this is the schematic for the amplifier, I hope it can help us. In fact, This amplifier is suitable for the youth because it fashionable and the sounds it is soft. And I want to upgrate it by myself, I hope the bass can be deeper. but I know what component should be replace? Best regards.
Attachments
If you need better sound just check the earth connection. If it is not connected you need to do it. The sound will be better
The design is basically solid (though a 12AX7 split load inverter is not the best choice). One thing that strikes me is the use of separate supply points for the voltage amplifier and split load inverter- this can sometimes affect bass stability. You might consider using some simple regulators to supply those points; it might even help the bass a bit.
Or worse 🙂
Regarding the bass, i won't be too optimistic about cap swaps. Most probably the output iron is the limiting factor.
Looks like a resonable candidate to be made into a variation on Red Light District, Baby Huey, or El Cheapo.
A LOT of info if you go searching on those names.
dave
Take a look at the Maida regulator in my Red Light District article (on my website) or the simple two transistor regulators used in the His Master's Voice phono preamp posted here.
Very possible. I'd like to see a frequency response plot- if the transformers are inadequate, the bass could paradoxically be made better by rolling it off sooner (e.g., by reducing the size of the coupling caps).
earth connection
I agree with Sacpul. The earth connection has something to do with the sounds. Please have a check with it.
I agree with Sacpul. The earth connection has something to do with the sounds. Please have a check with it.
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