|
|||||||
| Home | Forums | Rules | Articles | Store | Gallery | Blogs | Register | Donations | FAQ | Calendar | Search | Today's Posts | Mark Forums Read | Search |
| Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum |
| diyAudio Sponsor | ||
|
||
 |
|
|
Thread Tools | Search this Thread |
26th August 2010, 03:07 AM
|
#1 |
|
diyAudio Member
Join Date: Jun 2010
Location: SinCity
|
Started work on my stereo 7027a PSE amp
Took the schematic from a well known PSE807 amp, and swapped to 7027a's vs the 807's, though later I will test the 807's in it.
  
__________________
All my battles have been won, But the war has just begun. |
|
|
27th August 2010, 03:56 AM
|
#2 |
|
diyAudio Member
Join Date: Jun 2010
Location: SinCity
|
Got the transformer installed today, NOS Tektronix Unit, out of a Massive 4 module Oscilloscope, Overkill for 2 PSE 7027a mono blocks, But I really dig the end bell!
Had to show off the NOS clear top, side getter 12au7a Forgive the atrocious image quality (or lack there of) it's the best my blackberry can muster.   
__________________
All my battles have been won, But the war has just begun. |
|
|
|
31st August 2010, 07:43 PM
|
#3 |
|
diyAudio Member
Join Date: Jun 2010
Location: SinCity
|
Strange, cant get music to play, and when the tubes running on B+, my bias voltage drops to -5v, vs the -15.4 I set when the B+ is off.
__________________
All my battles have been won, But the war has just begun. |
|
|
|
1st September 2010, 06:52 PM
|
#4 |
|
diyAudio Member
Join Date: Jun 2010
Location: SinCity
|
Figured out the bias issue, bad resistor!
Got nearly all the hum out of the system, but now I have a problem with the sound coming out with no high frequency tones, it sounds slightly distorted, and kinda muddy, Suggestions?
__________________
All my battles have been won, But the war has just begun. |
|
|
|
2nd September 2010, 06:06 PM
|
#5 |
|
diyAudio Member
Join Date: Jun 2010
Location: SinCity
|
Set bias to -30v, clarity returned, and now it runs great! I omitted R6, swapped the potentiometer value to 50k.
__________________
All my battles have been won, But the war has just begun. |
|
|
|
4th September 2010, 02:08 AM
|
#6 |
|
diyAudio Member
Join Date: Jun 2010
Location: SinCity
|
Amp runs like a champ! Ill post the modified schematic later, for now, enjoy the pics!
  
__________________
All my battles have been won, But the war has just begun. |
|
|
|
| Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
| Thread Tools | Search this Thread |
|
|
Similar Threads
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| Looking for PP 7027a shematic | 807tubenut | Tubes / Valves | 1 | 21st August 2010 07:52 PM |
| I had an idea...maybe a brainstorm result..some neuroniuns re-started to work | destroyer X | Solid State | 35 | 8th June 2009 09:05 PM |
| Will this 2A3 PSE work? | kianbach | Tubes / Valves | 6 | 30th November 2007 07:11 PM |
| How do dimming interior/stereo lights normally work in an automobile? | Corn-Picker | Car Audio | 4 | 23rd March 2004 11:12 AM |
| WTB 7027A Tubes | webercarbmann | Swap Meet | 0 | 24th November 2002 09:37 PM |
| New To Site? | Need Help? |
| Page generated in 0.09717 seconds (76.66% PHP - 23.34% MySQL) with 10 queries |
And I thought my workbench was messy 
