SR45 amplifier

[johnsonad]

Paul, forgive me but are these going to be mono blocks or a stereo amp?  I can't remember which way you decided..

[Paul Joppa]

Because of the extensive new circuitry, the chassis plate is 10 by 16 inches for a monoblock - somehow I think a 16 by 20 inch chassis would be a little clumsy!

[xcortes]

And there's not enough room for my tl 404s!

[dth31]

Music to my ears, literally and figuratively!

[johnsonad]

What's the word Paul, how goes the build?

[johnsonad]

Hi Paul, how goes the project?

[fullheadofnothing]

PJ came over to the island this week to pick up a bunch of parts. I believe they were mostly for power supply testing (big resistors to simulate the load, etc.), but output iron and a sizeable chunk of wire was picked up as well. It is my understanding that the power supply is being built on the chassis rather than breadboarded, so the amp must be starting to look like an amp!

[Grainger49]

PJ came over to the island this week to pick up a bunch of parts.  .  .  .   

I hadn't realized before that PJ wasn't local.

[Paul Joppa]

Semi-local - door-to-door is about 90 minutes, longer in the summer when the ferries are full of tourists.

Josh's description is accurate. I need to put the fully loaded PSU output on the scope to know which regulator chips I can use for the filaments, and to know how much current I can take out without overheating the PT-7. Then I can finish the second large PC board, which has all the heat sinks.

I had hoped to do all that without using the full chassis, but there are so many wires with high voltage or current it just looked like a disaster waiting to happen, so I'm doing it the slow but clean way. Not really my natural style; there's a reason Doc doesn't usually let me build stuff by myself  :^)

[johnsonad]

Tha K's for the update and keep one hand on your pocket

[dth31]

Hi PJ.  Thanks for all the updates on the SR45 amp project--we appreciate it!

A quick question--have you and Doc decided for sure whether this amp will be an actual BH product?

[Paul Joppa]

Hi PJ.  Thanks for all the updates on the SR45 amp project--we appreciate it!

A quick question--have you and Doc decided for sure whether this amp will be an actual BH product?

We have not talked strategy at all.

But I expect it will follow some non-traditional path, like crowdfunding or limited production run. Like the DAC, it's not cheap and will appeal to a smaller audience than our more mainstream products. I can see a semi-kit also - the main PC board will be pretty large (for Bottlehead) and has an awful lot of components on it, which will make debugging through the forum a challenge. Dynaco did this back in the day.

[dth31]

Appreciate the info.  Thanks!

[johnsonad]

Hi Paul, how's the build coming?  Any updates?

BTW, this thread has been on going for two years now

[Paul Joppa]

Back-ordered parts (from March or so!) finally came in a couple weeks ago.

Yeah, it's going slow - I keep getting distracted with other designs, most of which have not yet come to the point where we want to say anything about them.