If I were wanting to build a big plate modulated rig today, I would look hard at skipping the mod transformer concept unless I happened to stub my toe on a nice mod transformer and reactor. Since this thread is about wrapping tubes around a mod transformer, or wrapping a mod transformer around tubes, then skip the pricey used stuff, and get a new one:
http://pwdahl.com/PWD_HamCatalog.htmlAt the above link there are 6 mod transformers for sale. Here are a few:
COLLINS KW-1 MODULATION XFMR
PP 810 MODULATORS TO PARALLEL 4-250A'S
CORE) EI-175 EE-STACK STYLE #) 80 E-I LAMINATED CORE
PR) 1800/2400 VCT, 18000/11600 OHMS PP
S1) 1768 VAC @ 283 MA CCS (6250 OHMS RFPA)
DM) HT = 6.400 WT = 7.000 DT = 7.000 MD = 6.812 MW = 4.750
PRICE) CALL or e-mail Plus S&H FOB Buffalo, NY WEIGHT) 35 LBS
COLLINS 30K MODULATION XFMR
P/N 677-0316-00, 200W,+/- 2DB 100-5000HZ
CORE) EI-150 X 2.5" 29GM6X STYLE #) 07 E-I LAMINATED CORE
PR) 2450 VCT @ 175 MA (32K OHMS)
S1) 1770 VAC @ .150ADC & .113AAC(16.7K OHM)
S2) 248 VAC @ .050ADC
DM) HT = 6.062 WT = 3.750 DT = 4.390 MD = 3.500 MW = 3.000
PRICE) $595.00 Plus S&H FOB Buffalo, NY WEIGHT) 12 LBS
JOHNSON VIKING 500 MOD
VIKING 500 MODULATION TRANSFORMER
CORE) EI-212 X 3 STYLE #) 04 E-I LAMINATED CORE
PR) 23000 OHMS P-P 2400 VCT (200-3500 HZ)
S1) 8000 OHMS (2000VDC @ 250MA)1414VAC 250W
DM) HT = 6.375 WT = 5.313 DT = 5.678 MD = 4.250 MW = 4.250
PRICE) $390.00 Plus S&H FOB Buffalo, NY WEIGHT) 29 LBS
THORDARSON P/N T-11M77
125-300 WATT MULTI-MATCH MODULATION XFMR
CORE) EI LAMS POTTED CASE STYLE #) 07 E-I LAMINATED CORE
PR) PP 811A'S @ 1000 VDC
S1) SINGLE 813 @ 2000 VDC @ 225 MA DC
DM) HT = 7.500 WT = 6.000 DT = 7.250 MD = 5.875 MW = 5.375
PRICE) CALL or e-mail Plus S&H FOB Buffalo, NY WEIGHT) 26 LBS
Jim
Wd5JKO