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Jonny69
@mf
I'm afraid my sour espresso saga continues.
I gave my Gaggia Classic a good deep clean (after a blockage in the solenoid valve which needed sorting) and took the opportunity to replace the grouphead seal/gasket, changed the OEM shower block and screen for a brass block and IMS screen and flushed it all with Puly Caff. Also have an 18g VST basket in.
I bought some nice beans from my local this morning and had an espresso from them while I was there to baseline the flavour a bit. I'm brewing 18g in and 40g out over 28-30 secs and still producing a shot that has unpleasant sourness. This has been the case across the beans I've had and I'm currently on a medium roast blend as opposed to the darker single-origin beans I have had previously.
The only thing I can now think is that I'm brewing too cold - I'm letting it warm up for 10mins or so, perhaps it needs longer and a flush through before brewing? Is there anything else I'm missing?
Advice appreciated!