Altec 70v 8w tranny for Paramour 1
- Thread starter galyons
- Start date
Paul Joppa
Moderator
Weird - the table is backwards; using the whole winding gives the highers impeedance and the lowest power at 70 volts, so if the diagram is correct then the brown wire is the 1-watt tap. That's pretty close to the 8K 1.25 watt tap of the Speco. You can check by measuring the DC resistance from black (common) to each of the other wires.
Will it sound better? Only one way to tell! :^)
I'd start with the highest-impedance tap, brown in the diagram, and try each of the secondary taps. Then repeat with the red primary wire. You should have a good idea of what sounds best by that time...
Will it sound better? Only one way to tell! :^)
I'd start with the highest-impedance tap, brown in the diagram, and try each of the secondary taps. Then repeat with the red primary wire. You should have a good idea of what sounds best by that time...
galyons
New member
Time has passed. Paramour has been "converted" to 45. Quite honestly I have gotten so enthralled with the 45's that everything else went on the back-burner so I could just listen! Now....
Different Altec Lansing transformer for possible upgrade from the Speco's. I picked this transformer because:
[list type=decimal]
[*]Should give the 5K ohm match for the 45's, per PJ's formula
[*]Pure 70v, not 70 or 100V.
[*]Bigger, heftier, (not that size matters! :-[ )!
[*]Will fit the "upgrade holes" on the chassis
[/list]
So the plan is to move forward. I was planning to do the MQ upgrade, but with the 45 conversion, I backed off due to the lower output impedance of the BH-5's. If this works, should my future upgrade path be the EXO-45 instead of the BH-5? .
Can I just follow the "Iron Upgrade" directions in the archives for just the OPT? Do I need to change the cathode resistor, (now1k6 10w), and/or a further reduction of the high voltage, (now 1k6 10w resistor)?
Cheers,
Geary
Different Altec Lansing transformer for possible upgrade from the Speco's. I picked this transformer because:
[list type=decimal]
[*]Should give the 5K ohm match for the 45's, per PJ's formula
[*]Pure 70v, not 70 or 100V.
[*]Bigger, heftier, (not that size matters! :-[ )!
[*]Will fit the "upgrade holes" on the chassis
[/list]
So the plan is to move forward. I was planning to do the MQ upgrade, but with the 45 conversion, I backed off due to the lower output impedance of the BH-5's. If this works, should my future upgrade path be the EXO-45 instead of the BH-5? .
Can I just follow the "Iron Upgrade" directions in the archives for just the OPT? Do I need to change the cathode resistor, (now1k6 10w), and/or a further reduction of the high voltage, (now 1k6 10w resistor)?
Cheers,
Geary
galyons
New member
Put in the Atec Lansing trannies....Wow! (connected the 1w/com and 8 ohm/com)
They are great, in every perceivable way! ;D Most noticeable is much better bass, not necessarily deeper, (My speakers don't go much below 50Hz), but tightness, clarity and impact are all significantly better. Imaging and soundstaging are improved with much better palpable presence. The soundstage is deeper, especially noticeable on small orchestral pieces with the brass instruments in the back row.
The overall voice and instrumental timbre seem more "real", especially brass instruments.
This was an easy change. Although the Altec trannies are larger, they just fit the original OPT holes.
I plan to get another pair to try with the 2A3's. I think I will need to adjust the the cathode resistor size fr the 5K versus 4K OPT impedence. I 'll try to find PJ's post...(unless someone has it to hand!)
Cheers,
Geary
They are great, in every perceivable way! ;D Most noticeable is much better bass, not necessarily deeper, (My speakers don't go much below 50Hz), but tightness, clarity and impact are all significantly better. Imaging and soundstaging are improved with much better palpable presence. The soundstage is deeper, especially noticeable on small orchestral pieces with the brass instruments in the back row.
The overall voice and instrumental timbre seem more "real", especially brass instruments.
This was an easy change. Although the Altec trannies are larger, they just fit the original OPT holes.
I plan to get another pair to try with the 2A3's. I think I will need to adjust the the cathode resistor size fr the 5K versus 4K OPT impedence. I 'll try to find PJ's post...(unless someone has it to hand!)
Cheers,
Geary
galyons
New member
Here is PJ's post, specifically for the Paramour2 to SR45 conversion:
* At various times I suggested three different operating points for the 45, depending on the output transformer impedance:
3K impedance: 250v at 36mA (standard), 1300 ohm cathode resistor
4K impedance: 250v at 31mA, 1550 ohm cathode resistor
5K impedance: 250v at 28mA, 1830 ohm cathode resistor
These had inconsistent estimates of the available power which I won't repeat, but they were generally in the range of 1.5 to 2 watts maximum.
Do these values hold true for a Paramour 1? They seem to be consistent, but just double checking, before I pull the 1K6 ohm and replace with 1K8 ohm.
Cheers,
Geary
* At various times I suggested three different operating points for the 45, depending on the output transformer impedance:
3K impedance: 250v at 36mA (standard), 1300 ohm cathode resistor
4K impedance: 250v at 31mA, 1550 ohm cathode resistor
5K impedance: 250v at 28mA, 1830 ohm cathode resistor
These had inconsistent estimates of the available power which I won't repeat, but they were generally in the range of 1.5 to 2 watts maximum.
Do these values hold true for a Paramour 1? They seem to be consistent, but just double checking, before I pull the 1K6 ohm and replace with 1K8 ohm.
Cheers,
Geary
