Old HF Units

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How good are the old Lincoln/Miller/Hobart High Frequency, transformer-based TIG units for learning to TIG?  I would love to have an Invertec or Dynasty, but they are out of my budget.  From time to time, a HF Dialarc or HF Idealarc pops up for sale for cheap in my area.  I have a 70amp circuit in the shop, so I think that should be sufficient for about 200amps from one of these machines.I like the Synchrowaves and Precision TIG units, but around here, they sell for almost new prices.Lincoln Powermig 255Hypertherm Powermax 45Thermal Arc 161SOxweld 24R OA TorchStill Looking for an Old Round Top Idealarc 250
Reply:A bit more info.... Transformer machine have work well for a long time, and still do today. It all depends on what your doing. I have both, and doth have pro's and cons.
Reply:Originally Posted by morgaj1How good are the old Lincoln/Miller/Hobart High Frequency, transformer-based TIG units for learning to TIG?  I would love to have an Invertec or Dynasty, but they are out of my budget.  From time to time, a HF Dialarc or HF Idealarc pops up for sale for cheap in my area.  I have a 70amp circuit in the shop, so I think that should be sufficient for about 200amps from one of these machines.I like the Synchrowaves and Precision TIG units, but around here, they sell for almost new prices.
Reply:Thanks for the help guys.Lincoln Powermig 255Hypertherm Powermax 45Thermal Arc 161SOxweld 24R OA TorchStill Looking for an Old Round Top Idealarc 250
Reply:If you understand HF and are in good condition, thats all that maters.  John G.SMAW,GMAW,FCAW,GTAW,SAW,PAC/PAW/OFCand Shielding Gases.  There all here. :