I have no experience with the 135w. It has been said on this forum many times that the 180w is a better transformer but I haven't seen people trashing the 135w (only that the 180w is better in comparison). If you can get a wonderful deal on the 135w, I suspect it will be fine.
I will say that I paid between $70-90 for each of my PH180's. That's a to-the-door price, all from ebay, and all in the last three years. So I would look for the 135w to be cheaper than that.
Mike,
I have a handful of PH-180's, and they're clearly superior, and because I bought them used and nearly five years ago I paid less than you did. In the last year though I have never seen them below $120 anywhere. You must be quite lucky. I also have a number of PH135's, not yet in use because the layout has yet to be built.
For this reason, I would consider PH135's in a heartbeat today, because they're still dirt cheap. But they do need a suitable circuit breaker since they have none internally that is similar to what's in the PH180.
Here are the options for such fast-acting breakers as I see them:
- DCC Specialties' PSX-AC -- For direct-to-track command control applications, or insertion before a downstream conventional throttle units like PowerStation, PowerMaster or TPC. Pricey but frequently cited to be as good as what's in the PH180. Adjustable trip point (current) over wide range. Won't operate below about 10 VAC (voltage).
- Lionel Direct Lockon -- For direct-to-track command control applications, or insertion before a downstream conventional throttle units like PowerStation, PowerMaster or TPC. Mid-priced yet reacts faster than what's in a PH-180 but not liked by some because it automatically resets, and because it apparently needs a filter choke in series with the output in order to avoid trampling on the DCS signal if DCS is used. Selectable trip point (7.5A or 10A, current). Must have at least 8 VAC in order to operate (voltage).
- AirPax 7.5 Amp PP11-0-7.50A-OC-V -- For use before or after a conventional throttle like PowerStation, PowerMaster or TPC, or after a conventional transformer like a ZW or KW, or for direct-to-track command control applications -- Least expensive but not adjustable or selectable. On the other hand if your using something larger than a PH135 you could buy two (one 7.5A and one 10A, current) and wire them up with a toggle switch to select between them for less money than a Direct Lockon. Also, operates down to just about zero VAC (voltage), unlike the others.
When you add any of these to a PH135 do you come out ahead price-wise over the PH180 at it's current price? Certainly if you use No. 3, but maybe No. 2 as well if you can get them cheaply enough and you don't mind the auto reset feature.
Mike