6V6 line preamp

[tubo]

I will be ordering 2 sshv2 kits from Teabags group buy, glad I found it and just in time.

[tubo]

Will 2 6ax4 damper diodes in full wave mode be good? ive read that they need a lot of current load for them to sing. I have about 16 of them, and thinking of using them. I'll see what I can do with psud as soon as I get home.

[tubo]

Originally Posted by Salas

That would give you sufficient voltage for regulating at about 340V with 47R R1, but 5R4GY is a more open sounding tube in my opinion. But its more limpid for voltage loss. So 300V and 7.5K load does not make it worse and you can use 5R4GY.

Thanks salas

[Salas]

Originally Posted by tubo

Will 2 6ax4 damper diodes in full wave mode be good? ive read that they need a lot of current load for them to sing. I have about 16 of them, and thinking of using them. I'll see what I can do with psud as soon as I get home.

Never used such but I have read they are good. Others may have practical experience to inform you more if they read.

[Tony]

dampers can be had at a dollar each....they have indirect heated cathodes and therefore lower forward voltage drops even at current levels seen with the traditional tube rects....

[tubo]

Ill try using 6ax4 instead. Hope theyll sound good. By the way if ] just use ac on the 6v6 heaters are they going to cause hum?

[Salas]

Originally Posted by tubo

Thanks salas

Another thing, you wrote you already got Hammond 193J choke, yes? Make R1 in the PSUD picture 150R for the 272HX Tx and 5R4GY with that choke. It had a 5H example.

[Tony]

Originally Posted by tubo

Ill try using 6ax4 instead. Hope theyll sound good. By the way if ] just use ac on the 6v6 heaters are they going to cause hum?

i do not think so, look at the heater cathode voltage ratng, they should be about 300volt or so...http://tubedata.milbert.com/sheets/093/6/6AX4GTB.pdf

do not put too much faith on "rectifier tubes singing", their mission in the amp is to convert ac to dc and not have too much forward drop....

[tubo]

Originally Posted by Salas

Another thing, you wrote you already got Hammond 193J choke, yes? Make R1 in the PSUD picture 150R for the 272HX Tx and 5R4GY with that choke. It had a 5H example.

Thanks, ill do that.

[Salas]

Originally Posted by tubo

Ill try using 6ax4 instead. Hope theyll sound good. By the way if ] just use ac on the 6v6 heaters are they going to cause hum?

What voltage those gonna give for that Hammond TX or what else you may take care about them ask Tony, for 6V6 in the line amp and AC I can tell you it can be made hum-less with careful construction. Especially for the proximity of heater cabling and signal cabling.