Stereomour release?

RE: Stereomour release?, posted on October 13, 2009 at 08:11:24
Jim_R Audiophile Posts: 110 Location: Rocky Mountains Joined: March 25, 2009	Can you folks also share any more details? Things like driver tube(s), coupling and parafeed cap values and ratings, any other features, etc.? You can assume I'd build as 45, but may eventually also want to run 2a3, so if there are optimized values for each tube, that would be good to know as well. Also, will C4s upgrade be available? Thanks, Jim -- Jim Rebman Audio is in the hear and now.

RE: Stereomour release?, posted on October 13, 2009 at 10:00:47

Paul Joppa
Industry Professional

Posts: 7295
Location: Seattle, WA
Joined: April 23, 2001

The circuit is pretty much the old Paramour circuit, with new plate chokes and output transformers (similar quality to the Paramount iron, and a step up from the old stock units).

Specifics:

12AT7 driver, shared between channels

0.1uF/600v coupling cap

coupling cap 3.3uF/600v (nominal optimum would be 2.5uF for 2A3, 5.0uF for 45)

three switched inputs, single volume control, no headphones

C4S driver load is standard

2A3 uses paralleled resistors in the power supply and cathode bias, one of which is removed for 45 operation, and the plate choke tap is switched between 45 and 2A3. No other changes.

Can operate a 2A3 as if it were a 45, for more conservative operation

If there is enough demand, and when he gets caught up, I expect Magnequest will have some upgrade iron, but there is no suitable output transformer yet.

For what it's worth, the (hopefully!) final iteration on the power transformer and output transformers have just arrived in the lab. I'll be checking them out while Doc B sorts out some other final details of parts selection and layout before we assemble the production prototype for the manual photos.

Incidentally, once this is a going concern I hope we can assemble the various bits of prototype parts into a few unique, assembled versions of the amp.

RE: Stereomour release?, posted on October 13, 2009 at 10:34:48
Jim_R Audiophile Posts: 110 Location: Rocky Mountains Joined: March 25, 2009	Paul, Thanks again, all sounds really good. -- Jim -- Jim Rebman Audio is in the hear and now.

RE: Stereomour release?, posted on October 13, 2009 at 17:03:23
chrisby Audiophile Posts: 153 Location: wet coast canada Joined: March 9, 2005	Too early to ask if pricing is finalized, or did I miss an earlier post? I've been a bit occupied with some landscaping projects for the past few weeks.

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Stereomour release?

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