MagneQuest Transformers
Parallel Feed Output Transformers
For SE 2A3, 6A3, 6B4:
EXO-36
2.5K:8 ohms, 3 watts max, permalloy core, solid brass channel frame. - $270 pr.
As used in the Paraglow 2A3 amp.
EXO-35 2.5K:16 ohms version of above - $270 pr.
For SE 45, 71A, 417A/5842, 6CK4, 6DN7:
EXO-45 5K:8 ohms, 2 watts max, permalloy core, solid brass channel frame - $270 pr. As used in the parallel feed 45 amp in October 1997 VALVE
EXO-46
5K:16 ohms version of above - $270 pr.
For SE 300B and variants ( VV32, VV 52, VA5300, etc):
TFA-2004 3K:16,8 and 4 ohm taps, 15 watts max, painted black end bells, M4 core - NEW LOW PRICE $300 pr.
TFA-2004 Pinstripe (M6 with Permalloy "pinstripes"), painted black bell ends - NEW LOW PRICE $400 pr. As used in the Blues Master VV32/300B amp in Issue 1&2 1998 VALVE
TFA-2004 all Permalloy core, 12 watts max, painted black bell ends - NEW LOW PRICE $500 pr. As used in the Parabee 300B circuit.
For 845, SV811, 50 ( 5K primary is often used in Japan with 300B as well):
EXO-50 5K:16,8 or 4 ohms, 20 watts max, M6 with Permalloy "pinstripes", painted black bell ends - NEW LOW PRICE $ 450 pr. As used in the Parable, Doc's own parafeed SV-8113A amp.
NEW! For 6C33C
EXO-800 800:16,8,4 ohms, 12 watts max, M6 with Permalloy "pinstripes", painted black bell ends, 40 ohms primary DCR! - $450 pr.
Parallel Feed Linestage Transformers
B7 15K:500 ohms CT, parallel feed line stage transformer, permalloy core, brass channel frame, 5:1 step down ratio, 17VACrms maximum signal input. 56,76,6J5, 6SN7,5965,5670,12AV7, 6N1P - $198 pr.
B7 5K: 500 ohms CT, as above, 417A/5842, 437A/3A-167M, 5687, 7119, 71A - $198 pr.
Either can be used in one of two variations of the Soul Sister preamp
Parallel Feed Interstage Transformers
RIT-5 "senior" 5K:5K (1:1), M6, channel frame, parafeed only - $250 pr.
RIT-5 "senior" as above, but with bell ends, parafeed only - $298 pr.
add $100 per pair for Permalloy core on either style
Great with 417A/5842 or 5687/7119 as driver. The RIT-5 "senior" 5K:5K parafeed interstage transformer is for applications requiring high grid swing. They will handle up to 160V rms input for 225V peak output, suitable for driving grids of cathode biased 845, SV 572, etc. Designed to be cap coupled to the plate of the driver tube, with no DC voltage or current on primary or secondary. Available with M6 lams in an "underchassis version" - channel frame and solder terminals for $250 the pair, bell ended "above chassis version" with Kimber leads for $298 the pair, and you can get either version with Permalloy lams instead of M6 for an additional $100 the pair.
NEW RIT-5 "junior" 5K:5K, 1:1 ratio, parafeed only, M4, solid brass channel frame similar to the EXO-35/36 in size. Introductory price - $198 pr
Handles 60V rms maximum input signal, note that this is a *20Hz* rating, not 30Hz like some others use. This will give you a maximum output swing of 85V peak, so this can drive grids of 2A3s, 45s, 300Bs, 50s, etc, anything running with a cathode bias of 85V or less. This unit is specifically optimized for cathode biased tubes. Bandwidth is super flat beyond 100kHz. You want low DCR? How about 55 ohms primary DCR? For comparison, the highly touted NC-20 is over 400 ohms primary DCR.
NEW RIT-5 " junior" NI Same size and specs as the RIT-5 jr., same awesome 100kHz+ bandwidth, same 60V rms input signal rating. The differences are that the lams are Permalloy and the DCR is a bit higher at 188 ohms in order to optimize the performance of the IT for the nickel laminations. Introductory price - $298 pr.
Parallel Feed Plate Loading Chokes
BCP-16 1mA, 425H, 4400oms DCR , channel frame - $80 pr.
BCP-16NI Permalloy version of above, as used in Doc's Parable amp. How about a grid choke instead of a grid resistor? - $140 pr.
BCP-14 10mA, 100H, 2075 ohms DCR, channel frame, - $90 pr.
EXO-01 20 mA, 100H, 985 ohms DCR, brass channel frame - $110 pr.
EXO-99 dual bobbin, configure for10 mA 600H or 20mA 150H, 1129 ohms DCR, brass channel frame - $198 pr.
BCP-15
50mA, 40H, 550 ohms DCR, channel frame - $90 pr. As
used in the Parallel Feed 45 amp, October 1997 VALVE
EXO-03
60 mA, 30H, 344 ohms DCR, brass channel frame - $130 pr. As used in Paraglow and
Parabee
EXO-04 60 mA, 50H, 317 ohms DCR, black bell ends - $198 pr.
B.A.C. 80 80mA, 50H, black bell ends, - $298 pr. As used in the Blues Master, issues 1&2 VALVE 1998
NEW B.A.C. 100 100mA, 48H, black bell ends, mounting dims. 3"W X 2-13/16"D, actual dims 3-3/4" W X 3-7/8" D X 4-1/2" H - $300 pr.
Airgapped Single Ended Output Transformers
TFA-204
3K:16,8,4 ohms, 8 watts, 60 mA - $240 pr. The
MagneQuest/Peerless TFA-204 is a conventional airgapped single ended output
transformer with a 3K ohm primary and
4,8 and 16 ohm secondaries, rated for 60mA maximum primary DC and 8 watts power
handling. Originally designed
by Peerless as a replacement for the famous Western Electric A171A transformer
used in the WE91 300B amp,
the TFA-204 is a great match for SE 2A3 (used in our Afterglow 2A3 kit) and
lower power (8 watts or less) 300B applications,
as well the best way to modify the ParaS.E.X. to a conventional single-ended
topology. The Paramour, Afterglow
and B-Glow chassis all have mounting holes that make installation of the TFA-204
a 20 minute procedure. The
MagneQuest TFA-204 uses modern insulating materials which take the sweet sonics
even beyond those of the original.
It would be very difficult to find a transformer with a sweeter midrange. The magnetic design
is virtually identical to the larger DS-025 and RS-330 models. Don’t let the
competitive pricing of these beauties
let you think they are "entry level" or "experimenter grade"
transformers. These transformers are made with the best
materials and lovingly stacked by hand by the premier transformer manufacturer
in the universe, Mike LaFevre. Mounting
centers, 1-3/4" x 2-3/8"
DS-025 2.5K:16,8,4 ohms, 20 watts, 60 mA - $298 pr. 2A3, Drop in upgrade to the AES SE-1
DS- 050 5K:16,8,4, ohms, 20 watts, 40 mA - $350 pr. 45, 50.
RS-330 3K:16,8,4, ohms, 30 watts, 80 mA, - $500 pr. 300B.
RS-500 5K:16,8,4 ohms, 40 watts, 80 mA, - $600 pr. 845, SV811-3.
RS-520 2.5K:16,8,4 ohms, 50 watts, 120 mA - $700 pr. VV52, VA5300.
FS-088 8.8K:16,8,4 ohms, 40watts, 80 mA - $450 pr.
FS-100 10K:16, 8, 4 ohms, 40 watts, 80mA - $850 pr. 845,211.
Push Pull Output Transformers
MQ-420-CL 6600CT:16,8 ohms 30 watts - regular $298 pr.
MQ-431 4300CT: 16,8 ohms 60 watts - regular $378 pr.
MQ-451-CL 2200CT:16,8,4, ohms, 120 watts - regular $458 pr.
MQ-470-CL 4300CT:16,8,4 ohms, 35 watts - regular $298 pr.
Peerless 20-20 series model S-271-A, configure as 5000CT:16,8,4,1 ohms, 200 mA, 80 watts or 1250CT:16,8,4,1, ohms, 400mA, 80 watts - $1200 pr.
Peerless 20-20 series S-275-A, configure as 4000CT: 16,8,4,2 or 8000: 32,.16,8,4 or 12,000:48,24,12,6 ohms, 120 mA, 80 watts - $1200 pr.
Power Transformers
PGP 8.1
120V primary, secondaries 350-0-350V 75 mA, 6.3V 2A, 2X 2.5V 1.25A, horizontal
(drop through) mount, solder terminals
- $165 pr. Used in Afterglow, B-Glow, Paraglow, Parabee.
5504 universal primary, secondaries 350-0-350V 100 mA, 5V 3A, 6.3V .5A, 2X 2.5V 1.25A, black bell ends - $350 pr.
NEW R-481-A 117V primary, secondaries 350-0-350V 120mA (choke input), 2.5VCT 3.5A, 5V 3A, 6.3VCT 3.5A - introductory price $240 pr.
NEW R-480-A 117V primary, secondaries 350-0-350V 120 mA ( choke input), 5V 3A, 6.3VCT 5A - introductory price $240 pr.
Filter Chokes
BCM-19 10H, 200 mA, 109 ohms DCR - $150 pr.
B.F.F.C. 10H, 200 mA, 18 ohms DCR!!!!!!!! - $298 pr.
NEW! Step-up/Step-down Autoformer
Here
is a way to adapt the 117V primary rated MagneQuest power transformers in
countries with mains voltages other than 120VAC. The autoformer will convert to
and from 100/120/200/220/240VAC, and is big enough to easily handle two of our
monoblock amps and a Foreplay preamp, with VA to spare. Not a transformer, this
device actually connects the primary of your power transformer directly to the
AC mains. Exposed terminals will need to be enclosed. Designed to
"drop through" a square chassis hole - $90 each.