Modify 5F1 to use 6L6

[leevc5]

How I modify my 5F1 kit to use and take advantage of the higher power output of a 6L6?
If not is there a way to put two 5F1 kits together and get one ~10 Watt amp?

[HotBluePlates]

How I modify my 5F1 kit to use and take advantage of the higher power output of a 6L6? ...

What kit are you using? Is this a Hoffman board, using all the parts on the BOM? Do you already have the power & output transformers, or are you in a planning stage?

[leevc5]

I already have the hoffman kit built.

[HotBluePlates]

What specific power & output transformers are you using?

[jjasilli]

What I did to my VibroChamp might help.

[Ed_Chambley]

Jjasilli,
Really been itching to build a SE 6L6.  Is there anything you would do differently?


Any particular reason for using 2 Orange Drops to bypass V1, or just what you had?  The 1uf/3k3 Bias on both cathodes I have seen in a Morgan Amp, but never done it myself.  Did you do that to keep Bass frequencies off a smaller speaker or just like it?


The 330pf from pin 5 to 8, how effective is it?

[leevc5]

I am using W022772 PT and W022905 OT.

[HotBluePlates]

What I did to my VibroChamp might help.

Jjasilli, what is the PT in your schematic?

[leevc5]

Thanks for all the help.  This is great!

[mresistor]

The W022772 6.3v filament winding is rated @4A so no problemo there. Selectable 600v or 660v on the main secondary as well. That's a good little PT.

[jjasilli]

What I did to my VibroChamp might help.

Jjasilli, what is the PT in your schematic?

My PT is stock Fender VibroChamp:  125P1B


Note:  the filter choke occupies the spot on the chassis which formerly held the OT.  The new, bigger OT is on a supplemental chassis mounted to an inner sidewall of the cabinet.

[mresistor]

Jjasilli, what is the PT in your schematic?

My PT is stock Fender VibroChamp:  125P1B



manufactured by whom?

[jjasilli]

It's a SilverFace Fender VibroChamp with a stock PT.  Don't know manufacturer.

[Fresh_Start]

Documents on AX84.com cover just about every power tube.

May I suggest a choke between the "reservoir" cap and the OT node on the power rail?  Much cleaner power supply.  Might help even more with a 6L6.

Chip

[HotBluePlates]

My PT is stock Fender VibroChamp:  125P1B

I am using W022772 PT ...

And the stock Princeton/Princeton Reverb PT. It and the W022772 PT are capable of 70-100mA on the high voltage winding, so powering a 6L6 (for actual increased power output) should be no problem.

... W022905 OT.

Okay, a 7kΩ:4Ω OT.

Assuming your B+ lands ~375-400v, you could bias a 6L6GB/5881 (or any 25w or higher variant) to ~62mA and get ~11w of output power. To get the most out of a 6L6GC (which would still only be a couple extra watts), you'd really like a 4-5kΩ primary impedance (probably what Jjasilli is using with his Hammond OT).

[leevc5]

I sincerely thank you all for the help and advice but it looks like the bottom line is that where I am with the current kit it is not worth the effort to just get a couple of Watts.
I will save the schematic for my next build so that I can get the full advantages of using a 6L6.  Or I might look at doing a dual 6V6 or 6L6 build, I'll have to do a cost analysis.  The darn PTs and OTs cost are just killers when you want to build a kit I wish I could find a source that had better prices.

[sluckey]

That PT will support a 6L6. The OT will too. Connect a 4Ω speaker to the 8Ω tap. Then simply replace the 5Y3 and 6V6 with a 5U4 and 6L6.

[mresistor]

It's a SilverFace Fender VibroChamp with a stock PT.  Don't know manufacturer.

If it has "606" printed or stamped on it anywhere   it was made by Schumacher for Fender.