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Author Topic: As Promised, Bluesmaster Non HRM Voltages.  (Read 2830 times)
plasticvonaband
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« on: October 05, 2011, 01:30:06 AM »

*****EDITED FOR FORMATTING IT WAS HARD TO IMPORT THIS FROM EXCEL AND IT'S NOT ALIGNED PERFECTLY, BUT YA'LL WILL GET THE IDEA Wink *****    I ALSO ATTACHED THE RESULTS OF ALL SIX AS A PDF FOR EASY READING******

So, since there are no 120 volt HRM Bluesmaster voltage readings on the Ceriatone site, and certainly no NON HRM Bluesmaster readings, so,  i conducted six tests using the various Preamp and Phase Inverter Tubes i typically use. The only ones i have not testes yet are the Telefunkens and JAN GE 5751 tubes, but i will soon and add the results to this post.
Wall Voltage was 119.2 VAC for the duration of the testing. I used TAD 6L6GWC Output tubes. I also took readings using both full HT/B+ voltage and lowered HT/B+ voltage utilizing the Sag resistor which drops the HT voltage, and thus drops the voltage across the whole amp .
I documented both high and low HT voltage, with the Higher voltage on the left side of the / and the low voltage on the right side.
I did not adjust the bias current during all of the testing, nor did i adjust the PI Trimmer. Of particular interest is the PI readings. My amp sounds best with about a 7-8 volt swing between Pins 1 & 6, and as you will see, changing the PI tube can drastically throw the voltage off, so if you are part of the camp that adjusts their PI trimmer, bear in mind that no matter which way you check it, the DC volt swing, using a sine wave and oscilloscope, by ear, etc, bear in mind that if you change the PI tube, you may wanna check and maybe tweak your voltages.
I was going to give a brief tone synopsis of each combo, but i decided to keep it just factual for now, but if anyone has any questions about how they sound, i will answer!!

So without further ado...

***************************Test 1*******************************                        
Bluesmaster 50 Non HRM      120V-119.2 VAC   9/6/11                     
Tube   Type                    Pin 1   Pin 3                      Pin 6        Pin 8   
V1   12AX7 GE Long     169/160      1.5/1.4         182/174      1.3/1.3   
V2   JJ ECC83S         179.4/171.1      1.7/1.6               193.7/184.8           1.6/1.5   
V3   12AX7 GE Long     239/228      39.2/37.5         232/221      39.4/37.6   

                                     Pins 1&8         Pin 3         Pin 4   Pin 5        Pin 6                   
V4   TAD 6L6GWC   36.6mV/27.8mV      445/425   445/426   -40      446/426         
V5   TAD 6L6WGC   35.9mV/27.8mV      445/425   445/425   -40      446/426         
                              
HT   346/339                           
HT   346/339                           
OT CT  447/426   
BIAS TAP 51.8

***************************Test 2******************************

Bluesmaster 50 Non HRM      120V-119.2 VAC   9/6/11                  
Tube   Type            Pin 1                   Pin 3                     Pin 6               Pin 8
V1   JJ ECC83S     172.2/164.5      1.5/1.4         181.3/172.6      1.4/1.3
V2   JJ ECC83S     180.7/172.3      1.7/16         194.4/185.4      1.6/1.5
V3   12AX7 GE Long     239/228      39.2/37.5         232/221           39.4/37.6

                                      Pins 1&8         Pin 3         Pin 4   Pin 5      Pin 6
V4   TAD 6L6GWC   36.6mV/27.8mV      445/425   445/426   -40     446/426      
V5   TAD 6L6WGC   35.9mV/27.8mV      445/425   445/425   -40     446/426      
                           
HT   346/339                        
HT   346/339                        
OT CT  447/426                        
BIAS   TAP 51.8

*************************Test 3************************************
Bluesmaster 50 Non HRM      120V-119.2 VAC   9/6/11                  
Tube   Type                     Pin 1               Pin 3                 Pin 6      Pin8
V1   12AX7 GE Long     170.8/162.8      1.5/1.4         183.9/175.2   1.3/1.3
V2   12AX7 GE Long     179.1/170.6      1.8/1.7         192.2/183.3   1.6/1.5
V3   JJ ECC83S             239/228              40/38         237/226      39/38

                                        Pins 1&8        Pin 3       Pin 4    Pin 5     Pin 6
V4   TAD 6L6GWC   36.6mV/27.8mV      445/425   445/426   -40     446/426      
V5   TAD 6L6WGC   35.9mV/27.8mV      445/425   445/425   -40      446/426      
                           
HT   346/339                        
HT   346/339                        
OT CT  447/426                        
BIAS   TAP 51.8

**************************Test 4************************************
Bluesmaster 50 Non HRM      120V-119.2 VAC   9/6/11                  
Tube   Type                     Pin 1              Pin 3            Pin 6            Pin 8     
V1   12AX7 GE Long     168.8/160.6      1.5/1.4         182.1/173.6   1.3/1.3
V2   12AX7 GE Long     177.7/169.1      1.8/1.7         191.0/181.6   1.6/1.5
V3   Mullard CV4024     185.1/176.8      55.2/52.8         180.2/171.8   55.1/52.6

                                       Pins 1&8        Pin 3        Pin 4    Pin 5    Pin 6
V4   TAD 6L6GWC   36.6mV/27.8mV      445/425   445/426   -40     446/426      
V5   TAD 6L6WGC   35.9mV/27.8mV      445/425   445/425   -40     446/426      
                           
HT   346/339                        
HT   346/339                        
OT CT  447/426
BIAS TAP 51.8
*****************************Test 5******************************
Bluesmaster 50 Non HRM      120V-119.2 VAC   9/6/11                  
Tube   Type                     Pin 1              Pin 3                  Pin 6           Pin 8
V1   GT 12AX7R   177.5/169.3      1.4/1.4         186.4/178.3   1.4/1.3
V2   GT 12AX7R   180.4/172.3      1.8/1.7         195.4/186.5   1.6/1.5
V3   GT 12AX7R   249/238           38.2/36.5           241/230       38.2/36.5

                                       Pins 1&8       Pin 3         Pin 4     Pin 5    Pin 6
V4   TAD 6L6GWC   36.6mV/27.8mV      445/425   445/426   -40     446/426      
V5   TAD 6L6WGC   35.9mV/27.8mV      445/425   445/425   -40     446/426      
                           
HT   346/339                        
HT   346/339                        
OT CT   447/426                        
BIAS   TAP 51.8
*****************************Test 6***********************
Bluesmaster 50 Non HRM      120V-119.2 VAC   9/6/11                  
Tube   Type                     Pin 1              Pin 3                     Pin 6          Pin 8
V1 Sovtek 12AX7WA     175.4/166.5      1.4/1.4         176.5/167.7    1.5/1.4
V2 Sovtek 12AX7WA     174.5/1661      1.8/1.7         188.6/1802   1.7/1.6
V3 Sovtek 12AX7WA      238/227      41.4/39.5         226/215         38.1/36.5     
   

                                     Pins 1&8     Pin 3           Pin 4       Pin 5    Pin 6
V4   TAD 6L6GWC   36.6mV/27.8mV      445/425   445/426   -40     446/426      
V5   TAD 6L6WGC   35.9mV/27.8mV      445/425   445/425   -40     446/426      
                           
HT   346/339                        
HT   346/339                        
OT CT   447/426                        
BIAS   TAP 51.8      

*****EDITED FOR FORMATTING IT WAS HARD TO IMPORT THIS FROM EXCEL AND IT'S NOT ALIGNED PERFECTLY, BUT YA'LL WILL GET THE IDEA Wink *****    I ALSO ATTACHED THE RESULTS OF ALL SIX AS A PDF FOR EASY READING******
               

* bluesmasternonhrmvolts66.pdf (16.8 KB - downloaded 386 times.)
« Last Edit: October 05, 2011, 03:01:35 AM by plasticvonaband » Logged

Overdrive is like peanut butter. Some like it crunchy, some like it creamy.
Bluesmaster 50 2x12 combo and some guitars.
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