[Niteshade]

These came out of 15 year old tube amps.

They did not work that well and always had issues. Looks like repairs were not easy either.

[FullRangeMan]

The traces are not OFC or even raw copper, seems to be some kind of solder, I suppose it not Silver solder, as PCB in tube amps is used by lower the cost of the amp.
Unfortunately there is many tube amps using PCB now adays, for fast manufacture and made an future repair more expensive.

[Niteshade]

The board and traces are pretty good quality. I have made PC boards before. The traces are copper that have been sanded down a little. Next, the board is submerged in a tinning solution to prevent corrosion.

[FullRangeMan]

Thanks.  These Edcor looks great in blue...

[Steve]

Yep, typical PC boards are not that good imo.

Cheers.

[TONEPUB]

What amplifier did that come out of?

[cujobob]

P2P can have its own issues, as well. There are tradeoffs...especially with this lead-free solder being used more and more.

[richidoo]

That piece of junk is not indicative of well engineered PCB tube amps.

[Niteshade]

Those boards came out of amps made from a reputable, large U.S. manufacturer.

The manufacturer doesn't matter: I do not like this kind of setup. Heat deteriorates boards and repairs can make a mess out of them. Naturally, it depends on what kind of damage it is and who's doing the repairs.

Some designs, like the ST-70's approach as well as Marshall's 9005 are not bad at all!

I still prefer point to point when done properly.

[lounge Audio]

Fender?

[dangerbird]

Fender?

nope-- I'll say this-- they are 1990ish,,and from a manufacturer that is reputable.I was not the original owner,,so who knows what their history is.I am looking forward to the work that Blair is doing with them.

[Freo-1]

Well, while I like point to point wiring myself, have a look at the insides of the Eastern Electric M88:





This amp sounds absolutely wonderful, and has made me re-think the fact that only point to point can provide the best tube sound.  I would put this amp up against any 40 WPC integrated tube amp I've heard.  It can also act as a power amp only if desired. 

[BobRex]

nope-- I'll say this-- they are 1990ish,,and from a manufacturer that is reputable.I was not the original owner,,so who knows what their history is.I am looking forward to the work that Blair is doing with them.

Well, if we're gonna guess, I'd say they look like Connie J boards.

[Niteshade]

You'll notice on the above photo that the power tube sockets are not mounted to the PC board. This is a huge step in the right direction. That's why I like the ST-70's approach and similar setups.

[FullRangeMan]

Looks not easy to remove this Eastern Electric M88 PCB to repair a solder track or component.

[djbnh]

Well, while I like point to point wiring myself, have a look at the insides of the Eastern Electric M88:





This amp sounds absolutely wonderful, and has made me re-think the fact that only point to point can provide the best tube sound.  I would put this amp up against any 40 WPC integrated tube amp I've heard.  It can also act as a power amp only if desired.

Looks like the M88 can run balanced; are you running it that way?

[lounge Audio]

You'll notice on the above photo that the power tube sockets are not mounted to the PC board. This is a huge step in the right direction. That's why I like the ST-70's approach and similar setups.

And that is NOT an el-cheapo PCB unlike the mystery PCB

[Freo-1]

Looks like the M88 can run balanced; are you running it that way?

Yes. It's a true balanced input, and it works well.

[DustyC]

Well, if we're gonna guess, I'd say they look like Connie J boards.

Yep, they look like c-j boards to me too. Premier 11? Some boards can really be cooked if you try.

[Niteshade]

They look like it, but are not. The C/J's are designed on the same principle and have the same issues. That must be an older amp.