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Title: As Promised, Bluesmaster Non HRM Voltages. Post by: plasticvonaband 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 ;) ***** 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 ;) ***** I ALSO ATTACHED THE RESULTS OF ALL SIX AS A PDF FOR EASY READING****** |