![]() ![]() at least I've heard it does as well as the BMR. Yes, flyback issues happen even with a matched load on the SFBM. So something funky was going on with that particular OT that they were trying to whip into shape (at least enough to be able to sell the amps using it). (The cap doesn't show up on any schematic, just the layout drawings). If you look at the layout drawings for some of the amps using that OT, you will see that Fender added some phase compensation to the NFB loop in the form of a cap shunting the NFB resistor. ![]() I don't have the numbers anymore, but the 022848 had ridiculously low inductance by comparison. For grins, I compared the primary inductance of the 022848 with that of the replacement Hammond OT. Doh! I finally got things sorted out and wound up replacing the OTs in all three with nice Hammond units. Yup, the 'other amp' was another of the three BMR conversions with the 022848 in it. I even sent it off for a recone, because my verification was that the speaker did the same thing when driven by another amp. It's funny, because I noticed the problem first in one of the three amps, and thought I did have a bum speaker. The NFB hookup polarity was correct (as the amps would howl like banshees when the polarity was reversed), but with the NFB hooked up 'correctly' they would exhibit bursts of approx 28k Hz oscillation on sine wave peaks, coming in and worsening as the amp was pushed harder.Īcoustically, this sounded exactly like a freaking coil rub in the speaker. In all three amps, once the phase inverter was redone as an AB763, with the 1M grid resistors and 82k/100k plate loads, the NFB went somewhat squirrely. ![]() "I've done three BMR chassis to combo conversions/complete rebuilds where I initially intended to keep the original OT (an 022848). at least I've heard it does as well as the BMR. Fender 1970 Bandmaster Head A37070 and Cab - 2nd Hand COLLECTION ONLY Details: Case/Box: None Overall Condition: Good. Some items we just can’t take back for returns, due to a one time function like strings or drums heads and other times it’s not sanitary to do so with microphones or harmonicas.Click to expand.Yes, flyback issues happen even with a matched load on the SFBM. We reserve the right to charge a restocking fee based on the return condition. Why is that number important? This will allow us to speed up the process of the return. Most times we will give you an RA number (Return Authorization). Please contact us as soon as possible if your order was received incorrectly, damaged, or defective. If the product was shipped for free, the charge will be deducted from refund, unless the reason for the return is outside normal circumstances. Please pack the product safely for the journey back to us. Most new items may be returned within 30 days of delivery and most vintage & used items may be returned within 3 days of delivery for a full refund, exchange, or store credit. If you placed your order on Amazon or eBay, we advise issuing the return request from your account on the platform of purchase - our Customer Service team will process a refund upon receipt of the item(s). If you decide you'd like to return an item, please contact your Sales Rep, chat us, or give us a call. That’s why we offer an easy return policy to take the stress out of purchasing from us. We understand that sometimes you get a piece of gear that doesn’t work out for you. We’re all musicians here at Chicago Music Exchange and we want you to love the gear you get from us. Please don't hesitate to reach out or call us directly at 77. If you have any questions, comments, or concerns, we want to know. Our shipping, sales, and customer service teams are always striving to create the best experience for you. Our Bottom line: We care! This is something we take very seriously, because it's what you deserve. Most orders ship the same or next day: We greatly appreciate your patience, and are working hard to fulfill all requests as quickly as possible, while practicing recommended safety guidelines. We are here to put your mind at ease and make your transaction smooth and enjoyable! As musicians ourselves, we want to make sure everything gets to you the way it should, every time. bob I'm over the hill and hittin'rocks on the way down no gear list for me. We realize that the online ordering of guitars and instruments, in general, can be a nerve-racking experience. The BMR heads can be easily modded into a much cleaner, and better sounding amp with Bassman transformers, and some minor tweaks. The CME Difference: CME's mission is to make sure your shipment will arrive quickly, carefully, and correctly. EXF, 50 Watts, original drip edge, two channel head with vibrato, original 2 x 12. You read that right! Any orders over $49 ship for free!* Shop 1968 Fender Bandmaster Head and Speaker Cabinet at Gruhn Guitars. ![]()
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