Re: [Harp-L] Premier 50

[MARK BURNESS <markwjburness@xxxxxxxxxxxxxx>]

That amp won't make 12W, irrespective of whether you fit a 6V6 or 6L6. Check the 
power tube pinout/tube chart, just in case it was originally intended for 7591A 
use (they used 4 different power tubes over the years, 7591A has the large high 
Wattage 150ohm cathode resistor at pin 5, 6V6/6L6 have it on pin 8 and at a 
larger value in ohms).

A 5K SE output transformer would be fine for either 6L6 or 6V6, so long as it is 
rated for <70mA you should be fine. Allen amps or Kendrick will have overrated 
Champ style OTs for 6L6 or 6V6 use. There are also a couple of Hammond OTs that 
would work fine, but be aware that these might be considerably larger than the 
original, so check out mounting centres.

Alternatively, as you note, a champ 6V6 OT  will work fine, be easier on the 
power transformer, but these are meant for a 4ohm load, not an 8ohm speaker 
(some vendors sell multi tap versions).

I wouldn't get too hung up on having the exact spec part.



________________________________
From: Dan Fritz <bluesharp@xxxxxxxxxxx>
To: harp-l@xxxxxxxxxx
Sent: Wednesday, 5 January, 2011 17:29:00
Subject: [Harp-L] Premier 50

Hi, all, 
I have a 1956 or so Premier 50 with an 8 ohm Utah speaker that came to me with a 
blown output transformer.  It also came loaded with a 6L6 power tube.  I am 
thinking that perhaps the prior owner swapped a 6L6 for a 6V6 and that the 
additional output blew the transformer.  I can't readily find a replacement 
transformer with the right primary wind resistance (3K to 5K) that can handle a 
12 watt output.  I'm wondering if the 6L6 tube is just wrong for the amp, and if 
I should just get a "champ-style" 5 watt-capable transformer and run a 6V6, or 
whether the 6V6 is the right power tube and I need to keep seeking a 
sufficiently robust output transformer.
Any Premier 50 experts out there want to chime in?
Thanks!

-Dan