got a used EZG in beautiful shape serial # starts with U--- so old style oval front- with grove tubes #4's . original likely?
Thought I'd go with the current recommended TS and got a bias rite for the job (always wanted one anyway). The GTs read 28 at 450V- about spec- at about 12N on the bias pot, Sounds good and pretty happy. I realize there are some little estimations the bias rite makes - cathode resistor method etc...
The new TS read 35 at the LOWEST bias pot setting at 452V. I can't go any lower, but I want to- sounds a bit harsh and is definitely louder (good or bad.. ). What's going on? 35 is safe for the tubes OK but at the bottom of the bias pot? with a suggested 28 per Doc's specs?
Are the tubes that different or is the newer model that different. Do I need to send the amp to the doc for upgrade?
Post by headshrinker (Marc) on Nov 23, 2017 11:01:50 GMT -7
My guess is that the new tubes you have are way out of specs. Doc always calls for medium range tubes. Yours sound like high. There are others who know more about the workings of amps though. I've never had a problem using the bias pot on Z amps and being able to get medium tubes to the right numbers.
thanks. Could be - I know this variable exists but haven't run in to it at this level before. I wrote the tube guy to ask. The numbers on the boxes are 47.4 / 2960 and 45.7 / 2910 from his matching process - over my understanding despite a long Bing inquiry last night. (some expressions of plate dissipation and output I gather, but I can't benchmarks for comparisons). The tubes are a bit warmer sounding after a few hours playing (or my ears are numb- it's a loud amp-), but bias readings haven't changed much. I worry I bother you folks as an inexpert hobbyist, but, I have built several guitars, an amp, own 4 others (2 Z's) and tweak tones compulsively best I can over years, so I guess I rate some small bonafides here. I take courage to post again (the lurker exposed). My apologies as applicable for your indulgence. And certainly thanks either way.
new set arrived. Plate current listed as 18.3 and 19.0- much lower. (lower than the medium gain Z recommends as it turns out) Biased to 28 per website - that's 27.4 and 28.6. Voltage read 470 (higher). These are nice looser sounding.-plenty of harmonic content. If there's even order distortion from the small variance in matching I certainly can't tell. Some nice blackface OD sounds at appreciably lower volumes. (celestion gold 12") I didn't need the Z brake to break up the cleans with pick attack. So I learned a lot. The softer rated tubes make a huge difference the character and feel , volume overall may be a bit lower but not much - just some earlier breakup and touch happiness. Whole different amp. Happy. Thanks, z talk. then I added in zen drive. well...
Jaguarguy (Mike): Hey Gary - Joe Walsh used a G12 65 in his Galaxie and it sounds great!
Mar 25, 2019 23:05:29 GMT -7
GuitarZ: So, I cranked up the privacy protection on my browsers, facebook, etc. I have to say I miss the music ads and such. I really don't need ads for watches and other random stuff. Maybe the internet knowing me isn't such a bad thing.
Mar 26, 2019 14:01:24 GMT -7
hayesgary307: hanks alot (Mike) I have been going through a Vintage 30 in a open back pine cabinet and through a Marshall 1936 C/B 2-12 I'll check and see what kind of speakers are in the 1936. I've had for a long time and I have forgot whats in it . Thanks for you help
Mar 27, 2019 12:06:54 GMT -7
Joey Beverages: hayesgary307 try a Z 210 or Z 410 with Galaxie ... also, yes the G1265 is most tasty and excellent
Mar 28, 2019 6:03:29 GMT -7
The Bad Poodle: This may be a truism... when you work in a corporate structure, the worst decisions always come from the top.
Mar 29, 2019 16:26:10 GMT -7
Lefty: The fish rots from the head down.
Apr 1, 2019 13:26:26 GMT -7
TeeDawg: Bad Poodle..........truer words have never been said. Imagine what it's like working for NASA. This ain't the nasa that went to the moon fo sho.
Apr 26, 2019 5:59:08 GMT -7
brayks: I have been absent for waaay to long. hope all are doing well!
May 1, 2019 10:19:39 GMT -7
GuitarZ: I'm okay with the AARP letters. You're still living and breathing? What the heck am I to think when a funeral home sends me a free consultation offer? Ouch!
Jun 21, 2019 15:41:26 GMT -7
The Bad Poodle: I bought airline tickets online... now every few days i get emails that read "Your trip is almost here but aren't you forgetting something?? You don't have trip insurance!" and i'm thinking..."is there something i should know about your plane maintenance?"
Jun 21, 2019 16:02:32 GMT -7
GuitarZ: Reminds me of buying my Honda. When they tried to sell me the maintenance package, I said "Is your car not reliable?" Long story short my wife teamed up with the sales lady to buy the maint package. Never again!
Jun 21, 2019 16:16:53 GMT -7