maxwall
Well-known member
- Joined
- Nov 17, 2004
- Messages
- 1,134
I've read thru many pages of Pultec EQP1A thread and the only off the shelf power transformers I've seen are the following.
Original :
Chicago PCC 55 ( electroststic screen )
(540 VCT) 270-0-270VCT - 55MA, 6.3VCT- 2A, 5.0 - 2A
other recommended specs :
(500VCT) 250-0-250VCT - 100MA, 6.3VCT- 2A, 5.0 - 2A
Is there one I have missed that better suits this project
_______________________________________________________
Sowter 9527 : 500VCT - 60MA, 6.3VCT - 1.5A, 6.3-5.0V - 1A $200USD
capable to power two units , has eletrostatic screen
Hammond 260C (500VCT) 250-0-250 - 75MA / 6.3VCT -2MA / 5.0V - 2MA
no end bells, universal primary,
New Hammond 270CAX : 500VCT - 100MA / 6.3V -2A ( no ct ) / 5.0V-2A $60 requires a fake center tap with two 100-250 ohm resistors on either leg of the heater filament wires to ground. Or floating arrangement.
Old Hammond 270CAX : 500VCT - 70MA/ 6.3VCT- 2.5A/ 5.0V - 2A $47
reported as lacking enough current in the high voltage secondary.
Hammond 271X/371X (560 VCT) : 280-0-280 - 60MA / 6.3VCT - 2 MA / 5.0V -2A
Hammond 370BX 55VA, (550VCT) 275-0-275 @ DC ma 50, 5VCT @ 2A , 6.3VCT @ 2A. $59.99.
This looks like another good choice. universal primary.
Allied 6K88VG : 500VCT - 40MA / 6.3VCT - 2.0A $21
Requires seperate transformer for 5VAC pilot lamp ( on/off light) or use 110VAC bayonet lamp off the primary for pilot on/off lamp. the 500VCT secondary is rated for powering only one channel only at 40MA. Shielded (grey wire)
Allied 6K56VG : (540VCT)270-0-270 -120MA/ 6.3VCT -3.5MA/5.0V - 3.0MA $41
This seems to be a great option since the Chicago PCC 55 original power trasnformer has a 540 VCT also, only .055MA. or less than half the current of the 6K56VG. 5V lamp filament included
Edcor XPWR106 $44
(550VCT) 275-0-275, 125ma / 6.3v - 4A (no ct)
no pilot lamp filament , 6.3V heaters must be floated
are there any others like Antek , Heyboer that offer a off the shelf power transformer that is reasonable in price and has the minumum requirements to power a EQP1A circuit. The main issue I have read seems to be voltage deficiencies in the circuit some have reported with some power transformers lacking correct specs.
Original :
Chicago PCC 55 ( electroststic screen )
(540 VCT) 270-0-270VCT - 55MA, 6.3VCT- 2A, 5.0 - 2A
other recommended specs :
(500VCT) 250-0-250VCT - 100MA, 6.3VCT- 2A, 5.0 - 2A
Is there one I have missed that better suits this project
_______________________________________________________
Sowter 9527 : 500VCT - 60MA, 6.3VCT - 1.5A, 6.3-5.0V - 1A $200USD
capable to power two units , has eletrostatic screen
Hammond 260C (500VCT) 250-0-250 - 75MA / 6.3VCT -2MA / 5.0V - 2MA
no end bells, universal primary,
New Hammond 270CAX : 500VCT - 100MA / 6.3V -2A ( no ct ) / 5.0V-2A $60 requires a fake center tap with two 100-250 ohm resistors on either leg of the heater filament wires to ground. Or floating arrangement.
Old Hammond 270CAX : 500VCT - 70MA/ 6.3VCT- 2.5A/ 5.0V - 2A $47
reported as lacking enough current in the high voltage secondary.
Hammond 271X/371X (560 VCT) : 280-0-280 - 60MA / 6.3VCT - 2 MA / 5.0V -2A
Hammond 370BX 55VA, (550VCT) 275-0-275 @ DC ma 50, 5VCT @ 2A , 6.3VCT @ 2A. $59.99.
This looks like another good choice. universal primary.
Allied 6K88VG : 500VCT - 40MA / 6.3VCT - 2.0A $21
Requires seperate transformer for 5VAC pilot lamp ( on/off light) or use 110VAC bayonet lamp off the primary for pilot on/off lamp. the 500VCT secondary is rated for powering only one channel only at 40MA. Shielded (grey wire)
Allied 6K56VG : (540VCT)270-0-270 -120MA/ 6.3VCT -3.5MA/5.0V - 3.0MA $41
This seems to be a great option since the Chicago PCC 55 original power trasnformer has a 540 VCT also, only .055MA. or less than half the current of the 6K56VG. 5V lamp filament included
Edcor XPWR106 $44
(550VCT) 275-0-275, 125ma / 6.3v - 4A (no ct)
no pilot lamp filament , 6.3V heaters must be floated
are there any others like Antek , Heyboer that offer a off the shelf power transformer that is reasonable in price and has the minumum requirements to power a EQP1A circuit. The main issue I have read seems to be voltage deficiencies in the circuit some have reported with some power transformers lacking correct specs.