An EF184 + 25L6 2.2W guitar tube amp

[kem69]

HB-1 Amp - An EF184 + 25L6 2.2W guitar tube amp

I forgot that I had posted an old version of this scheme here, in the The Hundred-Buck Amp Challenge thread, until an user of a Brazilian forum reminded me of it today. Coincidentally, the first name of this amp was 100Buck Amp.
It is a 2.2W amp, EF184 + 25L6 tubes, with a really good sound. The power transformer is a ordinary 30+30V 30VA. The output transformer is a 1.7K - 8 ohms SE .
Here you can find a review of this amp (in portuguese): Crow | The 100 Buck Amp | REVIEW por Zarbinatti - YouTube
You can build it for less than $100...


And here the last scheme:

*If anyone wants, I can update the PTP layout of this amp and post it here.

 

[Lampie519]

Cute amp. I will try it sometime !

 

[glaznost45]

Yes please post the updated PTP

 

[leadbelly]

That looks good. I'm into a more distorted sound so I would try an EF183 instead.

 

[kem69]

I think the EF183 is worth a try. Due to its variable gain, it will probably start to distort sooner than EF184.
I will post the updated PTP layout ASAP.

 

[Lampie519]

You could try the EF80 or EF85 as well (drop-in replacements)

 

[kem69]

NOT TESTED!!!

Here it is...

 

[robson73]

It has a simple tone control, would it be possible to add a complete one with bass, mid and treble?

 

[Printer2]

You could put one in where the tone control is but it will reduce the gain a lot.

 

[robson73]

Thank you very much for the answer Printer2! But in the schematic if I were to put the complete tone control where would it go?

 

[Printer2]

Break the line where the tone control is attached to and insert the tone stack. The wiper end is disconnected.