Phone: (336) 376-8354
Email: Germino Amps
Germino Amplification
1726 Pine Avenue
Graham, NC 27253
Germino Headroom 100
The Headroom 100 series consists of two models. Both are built on a full size aluminum chassis with spot welded corners. All filter capacitors are mounted internally except for phase inverter filter can which is top mounted by the power transformer. Each version uses a ss bridge rectifier. These models as with all Germino models do not have a master volume control. These are old school "turn it up" to get the goods happening.
Specifications on each model are as follows:
1st version is late 67 early 68 specs with high initial power supply filtering of 110uf. Remaining stages of screen supply, phase inverter, tone section and preamp are all 32uf. respectively. Screen supply filtering is 66uf, filtering for phase inverter is 64uf. Cathode follower tone section and preamp each use 33uf of filtering. Circuit available voiced as Lead amp with split cathode preamp, 33K/500pf. tone control values and .022uf. output stage coupling caps, or with Bass voicing/flat frequency response consisting of shared cathode preamp, 56K/250pf. tone control values and .1uf. output stage coupling caps.
2nd version is mid 68 to early 69 specs with lower initial filtering of 66uf followed by 66uf also for screen supply. Phase inverter uses 64uf of filtering and then 32uf for tone section and 32uf for preamp. These are original values for this time period. This version is voiced as a Lead amp only, split cathode, 33K/500pf. tone control values and .022uf. output stage coupling caps.
Both versions use a transformer set based on teardowns of an original Dagnall T-2562 power transformer, C 1998 output transformer and C 1999 choke. This iron is correct for the years late 1967 through mid 1969.
The two models are intended to give the user a choice between the two circuits and the two different power supply layouts available during these early periods of production with the Dagnall transformer sets. Both amps are very loud with the 1st version and its larger power supply being extremely percussive in its attack. Plate voltage is around 500vdc.
All models employ the use of 2 watt mil spec pots, NOS carbon comp resistors, heavy duty Carling switches, Cliff jacks, TAD "mustard" replica film/foil caps, Sprague and F&T electrolytic caps. Electrical grade fiberglass turret board material is used and the amp is completely handwired to perfection using copper stranded wire.
Either Headroom 100 version is a visually stunning and sonically inspiring piece of craftsmanship. These versions are the definition of loud classic rock tones! Extremely tight pick attack and a huge low end girth that only an amp of this power output can produce. Best for large venues but can be used attenuated in smaller rooms for those who dare and have good hands!